Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9029a1511a2558…

MALICIOUS

PDF

105.8 KB Created: 2021-06-25 17:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4726a862df88aad82eaf64b201043d4 SHA-1: 2ca05453a1640694eea454292b3274b2a8d57180 SHA-256: 7d9029a1511a2558892df715132d152ac76b929d9df4a0b55fd375156e0466f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://biotop-zamosc.pl/userfiles/file/tadalexifiwinifarumarib.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0ed082a721da4aa0563fe84dbd30dd9c/xosevotolijumajubina.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a9fjkmp1jle7t65ct3f0u8kls8/51685533323.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2c7c0aea---sifitulotolu.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7049701f321af2987ccbaabdb78b73e3/bofakaruv.pdf
    • http://saokienviet.com/uploads/image/files/mikobowek.pdf
    • http://sl-light.ru/design/img/upload/file/33603153625.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eba303080---lemotulozubepe.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fgkkb6ugsoh8v01var4juaasn0/46477048597.pdf
    • http://afghansolar.com/userfiles/file/lulijubemejibi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b287e8271---wixepozis.pdf
    • http://fdscience.com/UPFILE/userfiles/files/logosa.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0df6ab4f---7162420900.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1baecd2d050a3bacf4bf176105fc6605/wazatezumudikibinep.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/59783380187.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b6d7d8e626a9471f432a4fe8016928fd/vigubafonufezuxezoparig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+does+the+bible+say+about+sex+before+marriage+kjv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138f8.bin
ec9a11ec419740ab46a84e097a7ff56bea9f03e6435070e4d2d2dcc7f5fd64f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 17756 bytes
font_01_sfnt_off0001676f.bin
68ec447d47cb6b452b7b3e398a95735198271cf8e65efc1ea698f9ecec210236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1676F 11432 bytes
font_02_sfnt_off00018243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18243 16792 bytes

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