Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6557dd86df7d2c7…

MALICIOUS

PDF

80.2 KB Created: 2021-08-26 00:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b475bebec7cf843788763e5e8875047d SHA-1: 6270e6133398c564270a3221438ba65827fd4e77 SHA-256: d6557dd86df7d2c77a7153a4b1894d509b317e597a5dc8a3dd5dcd8620affaea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sportingclubalbinia.eu/userfiles/files/74739557711.pdf In PDF document text
    • https://cvsc.co/userfiles/file/21368748366.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27c9a2603---dorupapamegudefimog.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4a003d5760f5b67b54098012fc7e22a9/domifusuxawabu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4933f027a7---zovuxifisogilebusoruxa.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/bowawumibatezevoposaxef.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/wofisujinipij.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/796cfaddf1b585b3669ae93265862673/fiwuwoziwefumafu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c6d11b26---81752069807.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/ligemosobetiwof.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7e678ecf54cb0d0fb0d631b82ec73c94/57395579298.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8417a16a4566e917b7795baa459020d2/40891910787.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/subanaforolasevaviwasor.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5unrh7m8kq214uhret4049j9p6/dutexewawore.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e0cae40f---bineferifimofopuj.pdfIn PDF document text
    • https://kartplast.com/resimler/files/nozaxubugiletat.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c1db17d15---30294466044.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zikexaxukike.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/59572456415.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/vuxugomoxikumibapidogip.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5017d8847a---pewukavamulunowudi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae0fb847c---josizilobezaruzuse.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/dugovugitabelo.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/32950316876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ap+statistics+guided+notesPDF 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16660 bytes
SHA-256: ab6b22873a959c36549e93fd86b8bfb3136e141a124c02e899421a7b52f52196
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 10624 bytes
SHA-256: cafd07563cbfd2116feb4fb387dc4780c6a2c977a23c611e55659fd1efa951dc