Malicious PDF — malware analysis report

Static analysis result for SHA-256 96326cf438588daa…

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 23:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b861cda478f5a0ce766d8c99e8c4343 SHA-1: 62c637cd4ae5d8fb490d806ca4870a4e602a3e34 SHA-256: 96326cf438588daabe1ce84a26cb5c1468aeb726ab48204f7dc659ce0267fec4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gemculture.com/userfiles/file/mobal.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd628102f---fizizo.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/74q7sfn3km7h424n510afp6cn4/82483581683.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/prhg0eaisl1jrr5d19khon2nvg/jajukidi.pdf
    • http://altelaw.com/uploads/image/file/viwimuxupejupimonenimife.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0af31f99---81888758358.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2bf0bd441ae667227e01995fc5e658a7/76081882116.pdf
    • http://best-infosystems.com/userfiles/file/jeropuwun.pdf
    • http://albino-pitti.com/pub_img/file/bazogozezupunimikiriw.pdf
    • http://doo-san.com/userfiles/file/20210611153750.pdf
    • http://almar-bus.pl/userfiles/file/regizazekokek.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/tqro35qghfkatclvqjo272vek4/mebokavuxojekamofabixifit.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9fd580ea---52934899789.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/73895bf9852208cdbf6181abdac250a1/74964290326.pdf
    • http://saxonrt.hu/img/userfiles/files/zegab.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/2igbtj2pqg477fs3p91t6hn4cu/64141683002.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cb945fefd8528919a97b9837fad02321/72326657859.pdf
    • http://bigband-ulm.de/userfiles/files/79060049755.pdf
    • http://libertyquad72.fr/userfiles/file/najetedod.pdf
    • http://yds-wcv.jp/free_images/files/tififegitibuvoboxafetixil.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e3941812---5379349637.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a32eb8ad---14221766922.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7eb22f665ee39d8d3f59954bc8c9ac10/tujekujezuzit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=german+infinitive+clauses
    • 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_off0000e96e.bin
93faa9a2c5805a6b03f656e74572b3e513a33e6079d21d0071dfd3a7a434d4eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 18072 bytes
font_01_sfnt_off000117f0.bin
dcbaeb0f8e546b3beea0d92e5b13f278eee9cbe015c838b56d03ed748046c4fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 10584 bytes
font_02_sfnt_off00013025.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 16792 bytes