Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bad4a4642dea88…

MALICIOUS

PDF

95.2 KB Created: 2021-07-13 23:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d75d694dfb18e85a0f5041c64a4ffe9 SHA-1: a0f28252c9c5acfa14458e58d6b4310e360fd3fb SHA-256: 86bad4a4642dea8891e11864e76cf16124371937444999107b2e70ecac960443
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, which are likely intended to redirect users to malicious content. The presence of link farms and the nature of the detection suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aaca3de0---82664277096.pdf In PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/qe97ecu3tsndvdv6fdjvh2mk9t/ludevakasajexedovi.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/55913213605.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e5a03de4e---85782687783.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081396f76e05---vukasawifaduwu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607e5de721144---42277207145.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/poa6mh1nld08lh2ks61o31jhv3/64347188355.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39fe567ac---jeravuwifiviwifix.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5df4618485548b2a375560a120db94a/10195534877.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160840d1aa5337---9915468464.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/fazamibusagawodigukuli.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/11691983608.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/caec8a3cf3204584237bb05b5c7b09ae/besogerupuzerotug.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210611182109_fenkcr.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1a523684---48513706422.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d27964903100a3a9492d709cc05ad978/fozafuxazizufajenataxu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd28d8e716---90362689045.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/43121286071.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/807b8b1ffacc39320fbf58bd5cf83248/47459736498.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5591195b855f507aaf399680fafc5465/jazerix.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/zudoruzin.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec8cfde5a9---33995618281.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7aa9e7e1b---84854094629.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1eb51ea4---20848587790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=face+detection+library+androidPDF 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_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 10424 bytes
SHA-256: 2ecf8c9d0f7b5d3ba78f59c9db210c503f127b64678fbd4b43f57ed6861fbe7c
font_02_sfnt_off00013fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEC 17900 bytes
SHA-256: a879b22edea13a019127e0f2d8196282f1d7295f45d9b2554a648bee6462ded9