Malicious PDF — malware analysis report

Static analysis result for SHA-256 879bf28b5a89d183…

MALICIOUS

PDF

85.7 KB Created: 2021-07-16 22:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f86023ffdfa382756cf1f612884cc3c5 SHA-1: 452bd1b2933fe995fef20db5be7de90d39e56539 SHA-256: 879bf28b5a89d183a428082b6c1e4c9b6cf87aead092c312c86d2b052f80c87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da7d62473---36709198795.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a66ee497c---kotimonezajusutiketal.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/599c13ddc8243c622f1ee4bc5eb74416/92820394611.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b802efcb9b5---maxujeduvelotigolowa.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/pre0dug5jbaf1epi7hrph3b2o4/dazixakaxasurapef.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/7st9ot81poe9mn0glfrbefl6ug/ridovasefibevapef.pdf
    • https://najlepsze-w-polsce.pl/uploads/tuvefezu.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd88f616ad3---gibok.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0419db16268ba2c7f33d1d255efd0a71/mejamaka.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7c34ec2efa14907f250566aac96e9fc1/tavuludanarexogudiru.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb623a851c---povipazimiwofabi.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/pedot.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/mexibatasajobegomoxo.pdf
    • http://ahcxdq.com/uploads/file/081256509188.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e04121a035e---60266701757.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb15691b1b1---nanofug.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/47e10b27b98717b1957c77c3029f7400/pipoxakogufamugadavelivek.pdf
    • http://usagimatur.com/files/others/68898735658.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/mtesj5b6s035e1913oh1urrgic/zolirajudalanukajezo.pdf
    • http://bioscipublisher.com/files/upfiles/file/gigusovevaleravufira.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/8b5483a676ccc639b49ab8729ed4d4b7/2055725412.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4m5lpujm1c3v4f235vspa4djdi/xapusuvul.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/813266a612fff9d71feb278a668fdb61/vafixoxikejelaxeguwur.pdf
    • https://audit-advisers.com/userfiles/file/50480360688.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fox+drawing+step+by+step
    • 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_off0000edb9.bin
98f98a68e73c89358e2be9c6ee5bef62c129e19bf8844cd3f9bad29aaff092d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 16436 bytes
font_01_sfnt_off00011867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 16792 bytes
font_02_sfnt_off0001307e.bin
e2944e68802f05fd76c437769618032afd48b3aa7713167498e524324edd50e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1307E 10940 bytes