Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f5d68ce9feadd7…

MALICIOUS

PDF

115.9 KB Created: 2021-06-25 18:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57636ffa08e7f61b621f2d437d73acd7 SHA-1: 4bbf64a21c48197280ada92c31392dbbef6319fd SHA-256: 10f5d68ce9feadd7cb3b4a074ecc4bf77ae760212b29c5a001b0ee8980192f75
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other unknown domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb29c612b3---23521397350.pdf In PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/lulimote.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6566db96---78564025110.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/81026669022.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080321b4aea6---kimanejopu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/753f3ac0bb3d2b29a4410044e0a164c8/89392104637.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/23251786b346923bb54eba5a35a690e2/mokofele.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00e194b05---xekodo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/842819dc127448bb0fd5051f1ed9b6d6/17711133705.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/nunij.pdfIn PDF document text
    • https://argumentua.com/i/file/zijanev.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2b53ac065982243bde5ff767a891770b/78425690225.pdfIn PDF document text
    • http://dentherapia.hu/files/file/vojodizeliwiwijuz.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/17448684461.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/33631722610.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4ec4fe19b2357314bfe67c6f797581ab/49252617733.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/81371982927.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jiep3lf8inseooe4p2rmb6cij5/87516446053.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/kowagijunapefajezu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/gapisesazepakosa.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/3228928684.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/6ogmv5amg65vp17h0g5rgn7ans/muvuwajoxa.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/68012737742.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/7ef6d5c94a407a8d2070f8adbedb4dcb/17465977867.pdfIn PDF document text
    • http://blueyee.com/upload/file/240412403826.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c4fd7037e91d91a6e58d31c2f0ed93cb/xapikom.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/92044293890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+first+time+the+holy+spirit+is+mentioned+in+biblePDF 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_off000165a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A9 10820 bytes
SHA-256: 1f76b92a718149b0fb48412d614ad9fe4af754beb11741b4ea1dcfcbcbac2d03
font_01_sfnt_off00017e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001964c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1964C 16768 bytes
SHA-256: 5a61da8fc58a250fa5fde810339d65e792b08e639ec625e7dc49529279041353

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