Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe4e819be8be13c…

MALICIOUS

PDF

86.1 KB Created: 2021-07-21 22:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5be900b130451aff8d498de728af0ab8 SHA-1: 8b9752b803a5ff5dcbfd0f7b447ddfbc0691b040 SHA-256: 2fe4e819be8be13cac85971cab40bfaa661ecd0d59f13009570baf05738db3e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload sites and other unknown domains, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://aarogyamedico.com/userfiles/file/37308138840.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s3eqqb6alhe7skasc0ki2746gh/zotofitijowudewiw.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/pjnrj8al1rf45766qkpqui986l/tesapalojimilozererapube.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/takubarugukuxaxodevifov.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/zirawugejenesobazafixiki.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/86abdee0581242e3e32e07f1d2ea5656/77711532288.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f0781f76---66886271473.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f86770e5---wixoxovikak.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/gazutitub.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/pibesamilemizaf.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c019c512---774705434.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481efa548b---kugululu.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/64169814983.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/webuwerarobog.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3604777bbc---67036085545.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c8cc687f5cdbecad62544018f2caab82/baleforego.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/4702556468.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2f0a5b6e9---63067584719.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/59cpfk3tl6pprkvfq500lbkof6/79944511285.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f6ad649e130b9f82738ffc43ecaf802a/tukofigexilibap.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nunudatidepakoguparip.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vr06cijhqhn68ovvtv5dj2bid3/26448908557.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b539aed23---sawikigepawufu.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/74694193545.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/businiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=advanced+dungeons+and+dragons+treasure+of+tarminPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010411.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10411 17364 bytes
SHA-256: 6037f2d7ddac5fe0fcdfb61fc54f8428398117e2c62d76c7d16b338245a5a9b4
font_00_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 10920 bytes
SHA-256: 0e999f407b04e3b89c5434e169e7ea8ec9f4ff987bf44f8cb41a589d53b97e32

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