Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a513aa9fa3b433f…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 14:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11b9f5fa50924dce1719eb21c59184de SHA-1: 665ebed94c7c21a06ea90e9f2efc04010cbf1848 SHA-256: 7a513aa9fa3b433f867da94c40863b0bc001bc91f01acf85e46778bafdb3ee9b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f313a80ab9cf5f6bc303d26a9d7b8be8/61065022844.pdf In PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/782402563.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607717e866ae5---26798341283.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc4c1880f---rujagenozap.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/devasezoximaxujemuxor.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/q1k2sodhvjktl782pbdgdtbdja/talediduvunu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/iumqbmfrdg14ig4tfco4ksosir/fojubujulunopodupa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ebb7e06e7---jagidulafokasibivajaxudi.pdfIn PDF document text
    • https://dptech.vn/uploads/files/80630285671.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/vumimakasololisan.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/20483537017.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/53671392504.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/aec5f46074455df3e5054b12e07ee237/judigepovo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b95558707---powudexekiwuloxuwulivare.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494afe20d6---putufabuvimeduwanudapere.pdfIn PDF document text
    • http://promador.pl/userfiles/file/batovo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jagepuwe.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/98823972392.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4gc5pmrndtjeaoj3eb300rni7j/norugukorexugulubozukef.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9156f93f9d---72437258550.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c76292cbe---vogewovuzevefogewif.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f6b8982606c3912561009cdcbfa2b094/8780856563.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3eucdi4l2kt5r5fdssio67i494/3472364246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=water+cycle+of+butterflyPDF 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_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 10312 bytes
SHA-256: bb377a85fe4689654c3f222b78fe5677756b919756ffc07d9668010dbf963db9
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 16768 bytes
SHA-256: f10de43b1ca8c44a71bac994ecd8c579ce7d8dad30bddff074a6aa75bb64b3b3
font_02_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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