Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8401c9241dcb8fe…

MALICIOUS

PDF

85.4 KB Created: 2021-07-20 15:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfe7dc08b7cb25a7ee67d8cf507bd2ee SHA-1: b15792387987014c9614ee6145a4285fa717ee3d SHA-256: b8401c9241dcb8fec95c374f3617159c7bdb6b633ab95c9d5177a81ab870ced3
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of multiple URLs pointing to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ea696bd9f74aaad332b7ed71332128fa/18607681898.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/298c9daa2125862202fe06f1b5301d8e/tutedigenur.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085d45665136---vulivusitu.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19a26a502---23228061293.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jt5t8340va4hsse88q9t5g5icr/dizoganujuxemaxafuzu.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c72eee0d---56854037284.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a86adf143---50169991868.pdf
    • http://jjinline.org/file_upload/file/joleposulapukojez.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e33d093e67dda8ef2b6b34080cf2e6db/85328881241.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/57230589852.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/75848835412.pdf
    • https://syntellect.ru/Repository/file/5830842627.pdf
    • https://festival.bg/fckeditorfiles/file/95043083753.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc39ec9920---xuduxegarudonoven.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1346b69ae3---78133233999.pdf
    • http://esoftland.com/userfiles/file/63960871620.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e24698705---21103998388.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d79f3f8205c399cab8a52a41360cf938/8606092470.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837870b36ce---64500105784.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/129caa1159381396e6e2b861e01613f3/20226121116.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1ea7221859284fc0e82fa95b5bf3ca13/jitimadinonijorilogililif.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c9432508fc6875821e1bfd0c6056674/pabibikazawamekikujareva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cinema+hd+android+tv
    • 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_off0000ec30.bin
0e268390fc1e907357f1bd415cf2c65b13a88270187629ebda20d22509bf889c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 17156 bytes
font_01_sfnt_off0001191a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 16792 bytes
font_02_sfnt_off00013131.bin
2b395c3abc8f4bd8fcdeb6f72faecfa982c7f0c00d4d5e332fd4b2c18c215e64
pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 10396 bytes