Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7f1b67501ef37e…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 06:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 154bc944587cc32b2aab7ace09ee1408 SHA-1: ec97cc5a2fd16ed95f2225109ddd37642ef4ffe1 SHA-256: 1f7f1b67501ef37ef31bf8c93f66aa47871c011f820c935b36cee52d164a5d83
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://songuryazilim.com/calisma2/files/uploads/fagudivagoxotuf.pdf
    • http://bezagsecurity.cz/userfiles/bibigowa.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738c35da34f---mubejutinanabezakebo.pdf
    • http://sosnovgeo.ru/userfiles/file/27059557166.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a702f3ff5---fajipozefipa.pdf
    • http://canadanur.com/resimler/files/61072986497.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cigsu61rjj885i5qhbd1mn83v2/zururisizoxom.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j2rcps2dkdi4pur94ua3tr8ut4/nosurew.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf471fdca---57783367333.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0ccc0c21ce6e77e0f2ae48db9023c0da/nujijubufixureworupura.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af1691f02---2614165983.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/28874712620.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/m20omm19cuc6guv9ilb83oe2us/wozotakejozosusifomev.pdf
    • http://tuanlongland.com/upload/files/xajufo.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d92ce0873---wapila.pdf
    • https://soalmatematik.com/userfiles/file/84067626416.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bfb9dda3d---85414301099.pdf
    • http://planet-for-events.de/userfiles/file/31869680036.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c6216716c9e3a86e4d54f53876f3294d/96106075586.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ff318f28da3cf4ddff2d5b84ab374c12/mipusuwuzakapinutawev.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa8ea5eef---20595901505.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b7c155113e6fd2a2d844cdfc3ede3749/mujebad.pdf
    • http://akinmedical.com/uploads/file/dokimukitilasologi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=map+of+ancient+greece+ks2
    • 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_off0000ea4a.bin
6720ae7d96c2a47bf0634ed0dd221355996ae3fedee53bea426ed16bf426156e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 10812 bytes
font_01_sfnt_off0001037b.bin
d66059aaa2496d863103910a895cd3a26da3673466297639350c9e6a0c89f39f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16564 bytes
font_02_sfnt_off00012e7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 16792 bytes