Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4af0161aa6bba43…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 23:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a20c75765f8fdd85ac0d86504e64e180 SHA-1: 19a398c2fc5e35812467203eac4e7c9c6f909960 SHA-256: b4af0161aa6bba430d36743c7d3aa9472788d0fa359b9ff682b16ecc31a2b639
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely to host and distribute a secondary payload. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest a social engineering attempt to trick the user into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160714190aebef---sezasutuzuwi.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095641a44101---zekojudederaz.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/46a5112fe4a0cde70c893b748de85291/rowotadokerakunosezesibev.pdfIn PDF document text
    • http://slsnn.ru/content/files/43275774146.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/60395961105.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/30801287937.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/komulogasipit.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/80d5an2e917kqbhpu6sfpl1nlu/57615755908.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/xijaxexesixokiwepawap.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9ec89011b35a58c89ef0b6ba96388837/derosakij.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d28f5f92aff1dea91253388a25ffadb1/kizerokop.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/8759131452.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/goqg6nnheohgmnqd4f6f21dh3o/4707272979.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rtt8ueihhv94sgkuc5v6gcj1s5/bavumorepidofukuwuxikus.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa48d52783---13315792886.pdfIn PDF document text
    • http://apvn.info/userfiles/file/65874065346.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4cc7736c---buroxifozot.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/53571999359.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c99601e2---zogopijowikadazoridon.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210627100827.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/difopus.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/92990833965.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a831f387f51---suzajapamoserufemikewenid.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a5b0a32b---nakurizopafuwapowod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+certificate+of+vital+recordPDF link annotation
    • https://vitrec.ehawaii.gov/vIn PDF document text
    • 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_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10528 bytes
SHA-256: 5985bc860b1fe2ec7785a26f44051ce449dc560d94ed7dec20061ec897b21a4f
font_01_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 17616 bytes
SHA-256: 3960bc411ee41d036161360ee5653390f2212b2d30d2039de7c0ac7f0f3f9790
font_02_sfnt_off00014495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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