Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ef94844b366729…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 19:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d371975b291fea75bb827c50794406e SHA-1: 63808d28d716082f5f46110f57468eb393b6b494 SHA-256: f9ef94844b36672989ee9e48ec48749bfb7f1f8998f7a5b01a6c1e7d2f0a29bb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to what appear to be compromised WordPress upload directories, suggesting a link farm or redirection mechanism. The presence of these links and the overall detection indicate a phishing or scam attempt, likely using the PDF as a lure to direct users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/f1ucsgd7c0f1u976gae1ua215s/federuzufixo.pdf
    • http://architettoangeli.it/userfiles/files/31228250655.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb9cc3cf4---gomamitofaninoruxep.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/nosenosemo.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/foxabadu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/677fd7ed1ff17db78e59d0c040a170de/6462838223.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb5f12d21f---98154218423.pdf
    • https://dodatnagarancija.com/userfiles/file/49397551951.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c89d506c5a1f0a40ffc9ee9760e76cef/90599951890.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qi2j7cc0kgg2kp0cvu98rr62j7/depogowuge.pdf
    • http://toyotalongbien.org/data/dulieu/files/62290441634.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c8f812ad7a92a2599b765a87b2d29d06/munovol.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/86672463288.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d78e2ea32b---kijitofulesokosex.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c580ed4d9d0---palavuxidepudeb.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ujuslgfaaj28l0s4ssqd59aj45/risuliwozokoxe.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87e4e3ae2---86065888089.pdf
    • http://anvlaw.com/userfiles/file/96446148875.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ana4sat1t863urasvoo9cnrcmk/80464694016.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9896306fb1b539e4fe7d546dc2421a32/75497657305.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3b152f5eb7ef316c458b00df50d60d9e/88274882049.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/175cfc8f79e82a5a848950877c7301e0/jodebanitiwemufunipofav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+is+jelqing+done
    • 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_off0000ea58.bin
420dae29757d0ef2ef3ea55276c1bfb9795e1366b880e3974d6d4990215cf03c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 17264 bytes
font_01_sfnt_off000117a4.bin
c6abeb366c05dea613ee5ad4c6a74f0ceddccc9c55253c4f3ad4f7b0881307a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 10416 bytes
font_02_sfnt_off00012ec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 16792 bytes