Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4d8f7c3902cd5f…

MALICIOUS

PDF

90.8 KB Created: 2021-07-18 20:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3a8b039f2164f74eedbe9b013b3ef9d7 SHA-1: eceafe7cf2e04425116db42bce7194612828d850 SHA-256: ba4d8f7c3902cd5f439527495d760b6646719b85051eeea0082827dd7a55a717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/47ffdc00a18053316aa6c3b609fd3262/92170727584.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160714a7b7f5b1---75131365145.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/h247d312ta752f4ljmpu2ddvlo/87557404252.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9cd1d2597d9641865f9b9805edbd4e5a/90965374755.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cui7r31nakr1qmrugc6mfc8l71/kobafekezifamipid.pdfIn PDF document text
    • http://4bx.pl/public/file/zegofiruxere.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/34811789820.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xalerej.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/toluwogonosusapenig.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/51366929224.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5faec70e57---55037277916.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd27a8d2b3---xavudoziwavovoji.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/sabumonefajirenetoke.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0l96av8mhabjpa1ot40fd5rea6/22840449172.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/5424818003.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/mobogiburixasadirinaj.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816f560415f---wanusobisexusokusaro.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e65b1380e---43553646096.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8f323e1aa0f8f34ac3b03cac97783b48/62384053346.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/kefana.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/56919328926.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/otcn8fkaq9rb4op15utmalvre9/rivuvunarakasejowupim.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pafuremejipafafo.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/81477874967.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/pemomuzukizexesufugefale.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/97778543375.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/voxepef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=margaret+lady+in+waitingPDF 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_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 19432 bytes
SHA-256: 3e00af5fb4a46f1c6b4bba7ff5b92c12cb34de54b62e80e92efffc1bbbdea27e
font_01_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 10328 bytes
SHA-256: 3218430a0128834f386a643fab8fe2a5565214f0646e7267f40c7ba7d9116396
font_02_sfnt_off000145c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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