Malicious PDF — malware analysis report

Static analysis result for SHA-256 154b84d55dfc223d…

MALICIOUS

PDF

89.6 KB Created: 2021-07-22 04:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5a8b06d7cb93916fbd7160e56ba92eee SHA-1: 00e003f1ae3e8a3eebacaa968387086f3b1f8fe1 SHA-256: 154b84d55dfc223d31d1435dbc3aa26a2822f642f164dbd880b0584465924973
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 0.9902

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.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f128067d3d---jikovu.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaf503a84---58213329454.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/xaluzo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a86a5c9cbaa---dililomave.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5cfb1d660d8a9c8c826fdd58f4031ecc/ruvaxekazejepajevoduk.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f92e635d---53290586991.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44c11278ef---rorenewediwibile.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/29096995605.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/12449494465.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/h4iekvgpkefks9tji3o4adun88/74071772153.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/dupalufixerifezevewar.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/79vca3g8jcmeh6omttigj7o1i0/filexu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/92c159715777548fcbb2b255ede58ebd/newaterajaxabebugimomama.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/rj64na1q71dtig7fspjjfgb04u/vemelevavexuwugaf.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/kazubekenus.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/64782882787.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/77253777628.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/5581523344.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/wukix.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/44dae94e97c650e57b2353df1fbdb22f/55859978379.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c339e6f2e7e---zijoligu.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/zulekebubasaretedeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=de+force+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 10368 bytes
SHA-256: 2e7d97e97af918e5dd9fbd294dbee6eefba17f85d749ed5ebf0d958163d37089
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 17876 bytes
SHA-256: aa0abc98d222d6b027008866f53ecb09ac8038c9d38390ce6100354a79c702cc
font_02_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 18116 bytes
SHA-256: 932883f200fd0af1324c2b21e616f1430ff57565db2e75154dc4944c5273fc91
font_03_sfnt_off000135a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB5 2060 bytes
SHA-256: 543aeef1982481cafd6a652cd72d006865a316f348a971923c9f6f633605c563

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