Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b274f468dd93f30…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 15:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 98c36111bd24e63604d4327df0a2bb6b SHA-1: c3783ee83a56b2c656340296f548c83043b3e37a SHA-256: 5b274f468dd93f30cc96710e0206b01b05003e035c73ca2ddc2188be2b154487
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites, likely to facilitate the download of a password-protected archive. The presence of multiple links to compromised CMS upload storage suggests an attempt to disguise the malicious payload as legitimate file uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/735b19048ac85c9a55021c7bacc58d99/fowamebido.pdf In PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca01a16bc---vopogipapumeluwejupuve.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/eda99909d4bea2f73f3197a9a34a9064/dorazagujemafozik.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/871b4a8ea391f121cd539f5316fe3797/22296630720.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/399d70e799790ed44896b1ff857de151/70638197865.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf6178f454---zosipum.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ea72683d1b8e42e61ba2848f1547d426/42387197173.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/309168a27b3f68f945bee33916e681b6/96509080153.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4667a055d---volebuxixikipo.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/16226102872.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/64616050321.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/xifelade.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b092c6935a---likosura.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36fba5b85---xuzat.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8c23eaac---ninefojapanexibexufeke.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b74b8b49b---62843660693.pdfIn PDF document text
    • http://elitvorota.ru/f/file/75607444310.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fe005146---gojipajomiliveziwumowod.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/60826073889.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7437f51322---73971611068.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4ed7450f1---pinewenabuwunemuv.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae83a60ed8---livubagorunexuvomupowogeg.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/30292406849.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcc892ee8---93924907641.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58703275056.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/53780433362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=time+dependent+problems+and+difference+methodsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014463.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14463 18724 bytes
SHA-256: e2fd7227e12d2d83df116133e5d1b740914b6c493ff96c2c6b0f10bdc336a253
font_00_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 17224 bytes
SHA-256: 0340d7a48db22c06f3e673e21023e2c223e5772abc0026c29e711ff44912cc2a
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 10988 bytes
SHA-256: edf9bc73999d777244b279ddf732870f0aa4f2e5dbfb51f310efbe93c5d4991c
font_02_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1