Malicious PDF — malware analysis report

Static analysis result for SHA-256 50df7fd235a39fa3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 03:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1616d52d6ff8947110ec13e9e5786c9 SHA-1: a3e5bc5b8728203db35085aa085ead77729698aa SHA-256: 50df7fd235a39fa3ef7ad6757a7afba8b49e1b2132de78dd9ac972c77bb1198e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=shape+patterns+worksheet+grade+4 PDF link annotation
    • http://bogema.by/content/Files/pigoveluta.pdfIn PDF document text
    • http://fkhd.cz/data/img/86375657602.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c990675afb9---30787582298.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608509b172c1a---54841385071.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/63373103784.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/f1ej55ufkvrimfhurpghfjvbgd/rubizapabefilajew.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/bunomotuvejusadoxexa.pdfIn PDF document text
    • http://aqcons.vn/upload/files/80501093766.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/puginosapamukokaxote.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/63615756809.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1febe989fc840c6e027dc6ce531472b8/25349408692.pdfIn PDF document text
    • https://oferta.lt/i/File/zepeponodemikojoxe.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/naxokizelenasibiponiwori.pdfIn PDF document text
    • http://ternovykh.ru/content/file/44367132336.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607803022eb5a---sifufazani.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/9orccoit98n85gd2pb6qupovdd/mizofasupukisupusalat.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1267ede507---bunopowepisebukile.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44565b35c2---wamewikepufaxabejuweje.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210730075432917695654.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/xelufubajavawak.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6c5b34cd9---guxesuga.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/99217008768.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 17536 bytes
SHA-256: 9d1fe926d85de9f28e7c710489c892578b0ec7f544a2dbd177a5641a9c17ac97
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10864 bytes
SHA-256: 2ae63b062327df59e0f35dca13497366c556129aeb65e015126ba7eee370d363

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