Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b92b92234741a…

MALICIOUS

PDF

85.9 KB Created: 2021-08-01 13:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b301708b6a8e0ab14a956449beeb0afe SHA-1: d430f49ced53eca29e40956a1ccf888b79126726 SHA-256: 628b92b92234741a482473df15b5a5f27faabd59362db8a37555109a6ff60788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of numerous external links suggests the primary function is to redirect the user to a malicious host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5134db5c---faduwipiworatividaluvabe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a2c73fa7---38757784752.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3761625478c020b3a4ca7cdaad2b933b/nadivumun.pdf
    • http://www.wiz-fac.com/uploadImg/file/miwibelafokeraguzav.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c83hb65eqngn3eorvc3vl1hi73/18719948.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f2afdb0ed803cb6461895ab0a828099a/zirek.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3jrlbqo0ei9168qb6uc9a2d7f1/41842328180.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0a1a19050da2a36bae92711f34b2d900/96240162977.pdf
    • http://agendatourvietnam.com/hinhanh/file/bebagevulugi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fh04ibvb56kg59p1en3rrh630e/38601587811.pdf
    • http://churchtextile.com/userfiles/file/fufonuwinesitoroza.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/vimal.pdf
    • https://gulf-rope.com/images/bulk_images/files/kumulufujab.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rhdv2vtm1uilenth02c2r23q7n/33797913940.pdf
    • http://chroscina.com/userfiles/file/podisorezevijotasolur.pdf
    • http://aite-materials.com/upfiles/file/80372854985.pdf
    • http://kzlo.pl/fotki/fotki/file/fofukiwir.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8gsb6d0ebefvgi88f8hsn2igi3/zeboviwadaxavudobularup.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdffb82651---gibefakozu.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b134b27733---pamavezenejawenix.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d901379f---tuxifilajex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=naija+afrobeat+video+mix+free+download+new
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d355.bin
98f9fd684dc3b6075a7ed1152cea150ecbb30bab5566258fd06db3604bfa61cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 18072 bytes
font_01_sfnt_off00010234.bin
699dc03d44548c5a13cf8edf100f842cd2a448272b16902cb8cf7f7fc8447498
pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10848 bytes
font_02_sfnt_off00011b3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
font_03_sfnt_off0001334c.bin
66f18be9524db0b90f05e3da990d354c6ac9e1e19a160a35f889e0de8575cd7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 16300 bytes