Malicious PDF — malware analysis report

Static analysis result for SHA-256 83827268817b38bb…

MALICIOUS

PDF

89.6 KB Created: 2021-07-01 09:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04f68b9f1ba39a11725b5f045c457430 SHA-1: 1485c0a72344a010075c9f4c86d05945e48e5dcf SHA-256: 83827268817b38bbdb2b372dd54d5b7953ca2f0cbbadf2adb45ced4e32133578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm intended to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs align with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://annjulieskarpmo.com/userfiles/file/29524747015.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02fa68d03c---48169854872.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/99859847353.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ec64952e---13205267837.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f33ca6063---rovagagulotujusixat.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6fbb62842---10452652720.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160767c0b9da48---wegubivorasalesozaz.pdf
    • http://arohitourandtravels.com/userfiles/file/popedumukatafoguti.pdf
    • https://altaspin.com/calisma2/files/uploads/sokanape.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/komesijakufabosinetekuxax.pdf
    • https://eternalbliss.net/file/dewonogotaxelumad.pdf
    • http://app8itebarandgrill.com/admin/images/file/kevevusefekadad.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6568a9f33f---somixodejesewara.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/repemajepisikofimele.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/tipuwenasazitiwenelak.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122bad417f---9547981012.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a209ba737---lijarezodilizesazuj.pdf
    • https://eobliecky.sk/userfiles/file/debodajigikonojumot.pdf
    • https://hrmconsulting.biz/upload/files/riwuwebudi.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9416d021---22630425384.pdf
    • https://vandolderskb.com/images/usr/73258974555.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/n611jhii20dh445fnqu4ci8csp/judagoduto.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ou25rq1mprsha51kodejinocnd/xipekewufisazakoxifo.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/no30l20bg8md65kvkgkh351v4p/11952955760.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=black+desert+ps4+mouse+and+keyboard
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 16792 bytes
font_01_sfnt_off000110e2.bin
94f7dfae573b5790d8894e25d895963a9c03a79b94910716d12c04d7e5157100
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 11160 bytes
font_02_sfnt_off00012adb.bin
824735e3f50a912a73d366bf7505ff00e964b6a7dc6d96d66caa6d9395032827
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 17660 bytes