Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ccc957d819825c…

MALICIOUS

PDF

93.5 KB Created: 2021-07-17 06:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c16d79305a2e498e0b7e49cb97c07c13 SHA-1: a9439e56604ae9eabe542d1c5da80f10c5d96057 SHA-256: d2ccc957d819825cf57a43c95c11a7d9cb7d69f2b78ed39591768f22754898a5
156 Risk Score

Malware Insights

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

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 support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://alnahamgroup.com/userfiles/file/52220641431.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6f794de76f02ca0ba533ec244338aa6c/poxagarokikewobegebiwaro.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc1250628b---gomepebovetejolatalowabud.pdf
    • http://hondaotohaiphong.vn/upload/files/xixulerepejog.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pslhg5jaiomfej60hd2mojegni/80326337491.pdf
    • https://autotrans911.com/thread/admin/uploads/file/57153794383.pdf
    • http://apcmagon.com/userfiles/29339505067.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607396209dbca---pobozokikojuxus.pdf
    • http://amandatravel.com/userfiles/file/63462138431.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jh4nci4mf0us57sfmhkeko2knq/20639822079.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6k5fvfqpqmmfih7u4hbgbh5v4e/jasoxul.pdf
    • http://schokoladenfontaene.de/idata/wefebuzotizizumigoki.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caba31d955---9066228000.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/941jh1q0nuv3qs2t7jkec0jcnr/6623078153.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/75790d53c9cc55950cb1e57b2ee29eb4/ritolix.pdf
    • http://kulturazebrak.cz/userfiles/wosuwoluvozamerifisoxagab.pdf
    • http://coytex.net//ckfinder/userfiles/files/xasasu.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17c8e1013---9384188333.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c26b7004708fea5e7d27689179432ad/29782727422.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a528f1ec04---rinefixamivikib.pdf
    • https://daaeportrett.no/upload/file/45531399872.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/75bc5148c829e60500a678edfe3c930f/85459754817.pdf
    • http://canphantich.net/Images_upload/files/83950880814.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+way+to+sell+your+home+fast
    • 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_off00010b8d.bin
4e6462d8221feaa326df15451ab8bc0e2dace05fb998f743137f4b383dc9b141
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10636 bytes
font_01_sfnt_off00012414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 16792 bytes
font_02_sfnt_off00013c26.bin
72f77282105c5910a226d34e4bc8b67ea936477174de81346727a47ab38e74ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 17236 bytes