Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d0326d4e1aae38…

MALICIOUS

PDF

177.7 KB Created: 2021-06-28 04:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcbb1c9a38b77a37425509d805edc010 SHA-1: 6b131cdde7a055d6720b2a5bb24dd4dd6b8289a4 SHA-256: c9d0326d4e1aae385bb1758d12b34dae7043b9ea3b5cdc17b492cdcb9f6f5c41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=assignment+problem+using+excel+solver
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a961ac3b73b---39862892564.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5df5df16a9ed99914dd13dfa9a17c7db/4845414771.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1539e919d909c8e382f14de6e143d28e/befeloze.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8c1cc1d2ac16301858dee67cceda4a80/simokakukedares.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/54b966e8ddb25e88fbb576cb5d59a65f/rifubexozusapinig.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078aef463dd1---bigononepereresus.pdf
    • https://olterus.com/contents//files/vawux.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e9ec005b---saniwikimaxolezego.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8304308148592b0af13109549d3413dd/73772927289.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d43d7821ccbc799638c5fd7a62669b14/gifupaxoxagoxipemak.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0491ea7df1---lokite.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b257825154---31833794742.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6349959055b77bac01dd8cfbef596605/zireluma.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/3761429965.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/41tv8rn63bke6iq9tik3l3fn5l/47687196360.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/30f91264fa58d598bc19783c5969061f/judoborijewud.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd8339c35---7513567466.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c40899810---9575864222.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1dmdinthvvka71ovn20rov4hin/taxowinix.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/71476f0f3c061ca7dce688b9e02774c7/vugijel.pdf
    • http://dharmapremipariwar.org/userfiles/file/fuwajiledovofe.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/188f0340d46323b39273697dc5ee7a70/vajepabanavupiwopebutax.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d84358d63b801409dc6e96e0cd48edb2/90716938826.pdf
    • http://suamayin.biz/userfiles/file/53960524150.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b680bd76b0c---salurexuzotuwotu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025769.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25769 16792 bytes
font_01_sfnt_off00026f80.bin
c56da2a516383376db1d1999a885807c4774dd3eb141887117e1e2211cef3446
pdf-font-stream PDF embedded font (sfnt) at offset 0x26F80 10944 bytes
font_02_sfnt_off000288a8.bin
37f04f16ad4adf265d38cac747dbf8bbcc437c11ec7d2bab109fd53427fa68f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x288A8 18264 bytes