Malicious PDF — malware analysis report

Static analysis result for SHA-256 349d738b8f3d1463…

MALICIOUS

PDF

93.6 KB Created: 2021-07-21 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6e232d7296f46df313186c8786613d0 SHA-1: 8c6b885524ed50ac1661e4a9d388d7d2f9c00984 SHA-256: 349d738b8f3d146370b836b1d44f4e867ac0573a678e2c0ad48675f7684d8aba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the links and the detection names imply a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://agmatbaa.com/upload/files/kuwamopuwin.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21a7c99686---84786570550.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4f6ddd6cf2beadd285fa3f790eb7a9c/52236585805.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da88f1ada---buxitepab.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36cf83f9e8---lodofugoribod.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/148719f2d1c83299bba97da96efb1cc5/85143141311.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1705f61f74---laromajenamo.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/38ac9a5913e3231f71ca7f1a06c406df/57318759027.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/m2shufuku6uckq2pfs60j5pc64/vexuni.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/64225581043.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7465c4c1e49225266785becaf5e8f297/45264063615.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee50aa010a---68558138446.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa97a48e5---27563699142.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4990af47eb972fb93db6d5b589d78d1a/56551362881.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160807d16cfb85---73499821563.pdf
    • http://vorne-sitzen.eu/pcms/content/file/73581542315.pdf
    • http://goldnumber.info/userfiles/file/21852061813.pdf
    • http://khamtribacninh.com/images/files/39735521720.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u7l70o76soteb4s5r8esmbtch7/modetugame.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5d6716fc00098d5c14fa89f23d72c4b0/pelununuzomil.pdf
    • http://fabtur.ru/upload/files/75547663788.pdf
    • https://chaletsuenodesol.de/files/fapesanokamexekebu.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0c9a5933fb2965ef8c47cec5eeb12a2a/sebuvuva.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/1108525108.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+remove+search+suggestions+on+chrome
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e923.bin
a6b5b61d9d8d20ac981033d8c51ac7de878d9101496afa11527614c69f62a135
pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 17440 bytes
font_01_sfnt_off0001169f.bin
65d2db144c93b891c93abceb9cadbdce46e75894cf1fc40aca2f2412ebf6d896
pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 16200 bytes
font_02_sfnt_off00012c71.bin
53c8d2c540cdad21905b36316efb209d00a495670de4e6c5b067fde3836e43ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 10876 bytes
font_03_sfnt_off0001457e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1457E 16792 bytes
font_04_sfnt_off00015d8b.bin
a259b7bca6d02f3029ad7348548bd868c9496a47d3b3a49b34db01a919837f33
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8B 2364 bytes