Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9e8ef692f9dc89…

MALICIOUS

PDF

95.2 KB Created: 2021-06-26 09:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89807d26daec66f9c90cfc8103a8ac4e SHA-1: 24ac39752e7e836a26b9a51648771a5f7456c1e5 SHA-256: 7f9e8ef692f9dc89f4fa53a8ab841a6c866f6727b265002ae9f34fce4ac41116
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

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://laborke.ru/uplcv?utm_term=promising+meaning+in+english
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5bfe971f369c21fef63c7b29ba13e551/pomafutavedow.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720e72d9d1b---soxemagetokamagogunelebe.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/p904j4k3tt2envhjpr41ne5jao/23733780567.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/74ebdn3tlksbmojhc5m56heuln/70789574154.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd1c6567---vanafofumixevulowaralej.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160997b2656013---83198942237.pdf
    • http://gyobel.it/public/file/sugixezipu.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b738e64fc1e---37720026168.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dmpl4s7lp8re0he4tb4rcnc8va/77898570669.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de554f877---19383865144.pdf
    • http://dnepropress.net/files/file/5931161240.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/pemubirovuno.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9k62oc7r8ire5gbkajcgvj72s7/refotetakaxo.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mjt2l7lbljjs3bm0q14b14bs11/93345614613.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83d1e0ca2---fatufegep.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/27468141037.pdf
    • https://aulacvn.com/upload/fck/file/senudi.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/89073861173.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07590c42cf---xaxolomegakalewejurub.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed1c31816b---28021679708.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8a5be9a749d867addb96300fa652c6da/17867600000.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160818ed73fdf5---72619717517.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011267.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11267 18328 bytes
font_00_sfnt_off0000d753.bin
27d7b595fee4e50d28ebcd06626a53769eaa6903de03d487215f8980bcf05125		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 23780 bytes
font_02_sfnt_off00012fff.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 3464 bytes
font_03_sfnt_off00013d7f.bin
8b94fdda32e06c4ed1e61b6c9c09989dcd5870c023194e526ec355c19255216b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 10460 bytes
font_04_sfnt_off000154fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154FC 16792 bytes

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