Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b734329a149c579…

MALICIOUS

PDF

115.4 KB Created: 2021-09-06 22:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a10ca3ab6ef38498db170248ac21c497 SHA-1: b3cb0f5e0577fe76c1f36ae279755bc4fbcdda08 SHA-256: 4b734329a149c579b00a322902cf5a0694266f2a62d993dfab9d223b25b0f7d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5cgsjsa07rfkavf1h9h88cm8k5/wejatapu.pdf In PDF document text
    • http://strahovka66.ru/userfiles/file/mexorinovixerabisero.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/damezikamigututerare.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea2ed38382---1735800214.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/63433924378.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/muxevi.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/4327099963.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/auai0mvtqe9td4epign0n6qca2/25718190532.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ov1aj97bhkf4n5sr6a7he2fbl0/77304741625.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/93655352820.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079f836c94a0---28064183172.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nosuzojetivupovivezojo.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/zopojifijuxisa.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a717b60168---86432985451.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342e880303d---parig.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/ravoxidita.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/83050004344.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/91820123075.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cb53e8fd---808842685.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab848d4bd00---55265093254.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0b6ad7ef0a7f0ea06e260159e112d4a7/dopaxibudaruteroboz.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/manoxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=night+world+book+7+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_off0001626b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626B 17532 bytes
SHA-256: 6601eac28d9ae0d29c0223e10d52cbe311971369bd276f263113b400da801928
font_01_sfnt_off00019039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19039 10556 bytes
SHA-256: 55c8c028a40ffc4d084c4f4d0a6e8e717875d98b861f1ed77f6bce54cc05da3a
font_02_sfnt_off0001a7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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