Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f7d305c770fc99…

MALICIOUS

PDF

83.1 KB Created: 2021-07-05 07:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38fd2863e2a336fee5b0bbbb2cc7a240 SHA-1: 4fe8f97867b4fc9c04c067cfce7a8ad7d049e808 SHA-256: 73f7d305c770fc99f4671964c96b5824d37f429687b02d12f7c749066ea1e16a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The heuristic firings and ClamAV detection strongly suggest this PDF is part of a phishing or malware distribution campaign. No scripts were extracted, but the primary attack vector is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nomylo.ru/uplcv?utm_term=word+document+into+a+pdf PDF link annotation
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b8dc3fab4c09e0cf1b3229d7a9f466f2/fefibasodifakivem.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/53651406521.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fovuwarawovo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/s14g7uhj6csjo4uu886ao55ho7/tezolubidozurusupiluta.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/kugavulediwebavugudije.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb031c8536---84741132963.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8nt8q4ef26bt2c0coa82jqffr3/62480750737.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7ac67834---kagudasebupapu.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/nexumenunerarosomerewinu.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/87789032950.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49c9b7613---getefalul.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/tofafibemuxamalewitopa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/36e39c8a16cbe1b82fd2bade37c4d733/68323444937.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zemomigizuxefesud.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/89u8hn0d7fpubkdd6uvvh1cqsg/wejexurovenuxorirabuwule.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/62381707199.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/tugixunura.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7rai17uom2go4p85l71trg6br5/barefilofuzijemafomoj.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/14152723120.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1f4e51aafeae6d2cff0758973b1fe9dc/17695061178.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/blockcv2b2mf3le52biih6amo1/mupofobesufidilowub.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8fc7ea754d72f20c00efd49be59c1b78/sosavoronojusubejotifa.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/46158878529.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ecv4nfhurd0jo7l0pu4eb8f5c0/46262910483.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/jibivadifemokozonamoboxat.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01767878d---ropemezemoludumovokifogu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27bc4ea376---rogibapukevazarefeno.pdfIn 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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 10660 bytes
SHA-256: ec6b3436cff508faee1fe67a60c5c8e5ccb8d4fab929b798993d59f42cfb4b33
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 16812 bytes
SHA-256: 6195dbbda4995d7b849d11e9c305aad845022e880552038fc1496f918f616b79
font_02_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1