Malicious PDF — malware analysis report

Static analysis result for SHA-256 54400857251b9c97…

MALICIOUS

PDF

103.8 KB Created: 2021-07-22 11:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2872d871e03bf04d2497086ed2529a77 SHA-1: 978abe7792ff457a215d0556a2d84e256945dee1 SHA-256: 54400857251b9c976cc832b6ccfad74fae20dc80aa9cd1814df8d66957e1e015
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. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The file's structure and embedded links strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1626b4f2b47b5cf7d72775c499b852c9/wanafawowipogisenutoxomol.pdf In PDF document text
    • https://bosgo.mn/uploads/files/62276482701.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95d76604a---75012189409.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/kokolazipefadidukunu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d8rhhrjftfd9afjreo2ub0t0r3/vuzirilibevukipi.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/89635595602.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/mejekofejigabo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d945d2d1106---26102563223.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1014e838---jalamowobuba.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3c7nueo9pbkdt13pmraejb2r8o/rabebuninosanilexexipemu.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kaxujugirufudabumofusoj.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/lezimixen.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/7b806aa660609abde53acd87381c9028/60764549952.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/ginegidiroderag.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mewaxopapetupudekawamef.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fc8d5a2ccbacb1ef4d69f4a72e771c90/loxuvobijid.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da97751c4---26185310349.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/sidusemonu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/18486161384.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f8e2d09fe0597509758466fd75b340f0/30652753628.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d019664d59efc5430081a6cf9fbc1005/12235745518.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0e4af3f566f37edb6304cd232c567f02/mumoz.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/69264884412.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/548etpo2tljc050ckf5t6vce46/62243898457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=scarcity+example+sentencePDF 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_off0001310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 10708 bytes
SHA-256: 31ada82065eb6d93d4196cce483c3c2e097a9dd6da065b14e92d461618bad2e3
font_01_sfnt_off000149a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B3 17372 bytes
SHA-256: 423728d763e01704a8ff7e971f4aa44a41fef11416cceed331949e6968ee1577