Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b8f8d10f10fbac…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 10:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d15984f91441190e02b6bd461ea4291e SHA-1: d96fffe0441781fe0eab2e720e5aa5f6e2c5e451 SHA-256: e7b8f8d10f10fbacf4bd554d80a130626afce623356bbc377ae65431b8942adc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress sites hosting further malicious PDF files. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8cc999248982967e9b5705212e5aded7/padebagosodes.pdf In PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/kajujidoliraguwejubotiji.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/semuvakosufogalezixuvur.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/damixiwesuladu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/safasojowuzoxadotikoweze.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086774959ac9---totilukiziw.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e824090a65f864165a85ead57a205747/6379994668.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827875b71fe---82242396175.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/vawufatarife.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/betenalileboluved.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/gubebudajetuwezu.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/68544023393.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/301690beda9a18355c8429e8b8033096/luzimukeraxip.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4547725c---gavibobu.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210611000835.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/wurabozilurezepevukazise.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/84455698268.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nipaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hd+webcam+c615+pdfPDF 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
font_00_sfnt_off0000bc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC37 10624 bytes
SHA-256: 5cfa403403b84f964e186b81b82d100c8b64dcce0b6fe3b1de4c1cadb9d7a6b2
font_01_sfnt_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 18560 bytes
SHA-256: 8bacac1fcfc56b97243d75f17cac6f944b3dea37c7531956c7d48a3cbda016ce
font_02_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1