Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7c22fa5e95e2e4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 06:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f89e495f3ed2e2efb76d24bed751a9f SHA-1: 62e38648c0651e9b7d4d68b1f83770eb5446d10e SHA-256: 0a7c22fa5e95e2e45eaff8ec1917ccf3939580c47b9aaf1ed5bb59cf0fca31e7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This suggests the document is designed to act as a link farm, potentially leading users to download further malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723434c612e---31568616987.pdf In PDF document text
    • http://bigband-ulm.de/userfiles/files/3088871015.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vgtiasf2a9qv2g932ta8rfa60n/88744500143.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081770759c82---86344615321.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/e64em77vjedkrlqupkleqrf0c4/63242507372.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608d351956841---14683501375.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/kozisavox.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/rekufugid.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/42028343158.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6uh2neoqv59g5ka259m7a33jiv/53598209722.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/34977768019.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///buvawanilevopijadax.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/85459382581.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/45499843154.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/nket9ntsu654iv4q457on9q8bl/96215936282.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/50615f28c575801f6a9687df9d5c6280/21355464096.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/vedasigejajerit.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b31df2ec932---18191884355.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/benopowadiwuxeranosabij.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/54832031832.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/fvdv80n0krfj9hgj607ma92t9c/4464462767.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8a23b528fabf9640c8f31c230c46df14/92440713059.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30a00ad39.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/luvajumefanerinopajoga.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b40066406874cfc640a8f2790d492acc/62858940744.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/13296813218.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h28hknhfip05tpbmo9bdk066e2/fikafaxatatekam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manually+create+partitions+for+windows+10PDF 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_off0000b722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 15044 bytes
SHA-256: 95bcf4b2c3e93b9b4e59b62b74f40888870a6cb7f8d9edb7de5126d17bc69b09
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 11080 bytes
SHA-256: d1dacd4377a6c796ff81783f0c6fbe1e8ee1946e850eb7451b7767dd3ab01da6
font_02_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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