Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df4ca1ecc623b7d…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 08:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffaa54723157eaf78cd721fb40c2362f SHA-1: e493bcf477060b77677e6e6f693d76b08dd22885 SHA-256: 3df4ca1ecc623b7d531994d14150de658955cce0c6aeda2cfd537c4f1df27f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071114fc2e31---pimegapaj.pdf
    • http://immobilieninvestors.eu/userfiles/file/96577004054.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0cma430fk7pd7d7k2teqvs06n2/kejetametaso.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8d39be94b367e8d77e494a47533f1fff/38919619593.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/41b39af0d9080f38afc0c2b3f8f98320/53028599486.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sufatumedetefapatiser.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/03966793aa098452e42b025b810d43a5/51066029840.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9a496e9d---pigub.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702e17dedbf---mevomufozajoriwapobek.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d1cedc33c1aa7f2fd9ad52a5706a51c7/marixevadewafonegojivi.pdf
    • http://energo-winstal.pl/userfiles/file/98518641308.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/804790ga4ptqbiejjbc4iu4abl/81292637961.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ab8694edd---222712181.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/v2gha99vp1nkaumrn3fvd6792u/74873406572.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53de658e2d---44905630262.pdf
    • http://kapsalonvogue.nl/files/file/vidavuzop.pdf
    • https://charterfori.ir/basefile/charterforiir/files/30698223433.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6626901b4---nojufofup.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070bb21d5dce---18402093626.pdf
    • http://incucinaconalberta.com/userfiles/files/tujudebixapexojub.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be60a871ef1---80514431854.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/06f15fae176131a2451903f5654c6158/lowunumovivajurinukajuwov.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/428f29f59bad20361c9ef2e555aefb44/sijajareroduzux.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e560d249---80026853902.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/e3ea82178a9b658028e31aa3c19868bc/wirob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=prove+your+mettle+meaning
    • 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_off0000f828.bin
01a04d544af08c323a415b7735e0020636fb825cdeb736f5c24bf0572dc5e807
pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 10564 bytes
font_01_sfnt_off00011045.bin
f5215a371ea6933ac73f7d90aaa3320424cb2326e4a6dde6c563a95e54c333c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 18348 bytes
font_02_sfnt_off00014043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14043 16792 bytes