Malicious PDF — malware analysis report

Static analysis result for SHA-256 711059972d3a94a4…

MALICIOUS

PDF

93.2 KB Created: 2021-07-02 18:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3dd6a76cb31ed2c4a23e36b560135a9 SHA-1: e27c3cdf4f1caf5f2545f647f029e1d2924a58c8 SHA-256: 711059972d3a94a47833ca566894483fe61274ac4be3116ac272fd6262d4dbad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ecc8ab98bf2202bfded6bb29197dd342/93778567238.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/6666214407.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39426484---xurojanafogok.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/xajajozoga.pdf
    • https://oklogistic.lv/upload/file/rumilusoraleragojedij.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6d395f84dd5ac0a7af73a9a31932361a/86613643611.pdf
    • http://dianacb.cz/userfiles/file/15958255437.pdf
    • http://americandeliorder.com/uploads/files/88492884498.pdf
    • http://blevy.com/ckfinder/userfiles/files/9535339347.pdf
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/mifipokigelojoga.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/daxawojerasog.pdf
    • http://sns.hu/_user/file/wazoxizodopibinubexideje.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7dca793c827f2ed2ed22c8d9d1157353/62883711674.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ef565c3532d55f87c4fd5c0b5f62612a/kaxuses.pdf
    • http://bigandtallking.com/userfiles/file/47386403766.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/40c7d642ff3d0087292ae4ecf5028070/57336364718.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d4ed1b31---90919123259.pdf
    • https://sjalikave.hu/pictures/file/88291743016.pdf
    • http://odpadykj.cz/UserFiles/File/99921406985.pdf
    • https://gazelletr.com/userfiles/files/wakodamowifawejesi.pdf
    • http://ezibra.pl/upload//file/31406810219.pdf
    • https://mimpiindah1.com/contents//files/81142191314.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4gf50v8o9t2517j8r2mtmi1efn/38884760126.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=marriage+line+curving+upwards
    • 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_off00010c0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 16792 bytes
font_01_sfnt_off0001241f.bin
9610bd2086bb40b6832aa4976f7cad61168ad9fa7e068c7d06197204c3c014ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16464 bytes
font_02_sfnt_off00014eff.bin
22e77c9a70c52b0587d7ad467afb4873715477b55eb46f184e0752e5ff9ea34d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFF 10716 bytes