Malicious PDF — malware analysis report

Static analysis result for SHA-256 6744bf1e142273be…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 18:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0f2209ad6aa1e4ff49428b5d98dc6fe SHA-1: 5b67488d792262737829bfcb299bf2568e97a9cf SHA-256: 6744bf1e142273bee6ee1519b4920ec0a928697368ce385683e0863bdcf3abd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress installations, suggesting it is part of a link farm designed to distribute malware. The presence of external URIs and the compromised CMS upload links indicate the document is likely a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r6khpsn0v3sd61tt847n1a07b4/23429631212.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ad47kf16r3b9jgi95qamj5vk6s/raneno.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734cff9caf0---61048879032.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e583765df---zosojilejeradijuze.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tp1ae4rc0vik3h3bl3pl6q2a85/75505566100.pdf
    • https://salvatoredivilio.it/userfiles/file/muwarifiz.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/s7mv2i6heb07saeji19t043ad0/tufuranuvukaxisasotinu.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/11107416295.pdf
    • https://takipcisec.com/calisma2/files/uploads/14446208313.pdf
    • http://naturallabs.de/userfiles/file/88937203679.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0cac8af3c7ee7541ce73c19719ab482b/8169430500.pdf
    • http://randoquad72.fr/userfiles/file/52612990844.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/penigozopunujekevavem.pdf
    • http://stinpo.com/ckfinder/userfiles/files/jujesuvetirixuwefidu.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8vbtdqsdscuvige9iua5igmpa4/zerepuwoxuz.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbaf6b3aff---32910616422.pdf
    • http://skrabl.pl/www/rpbd/fck/file/55544405960.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa4dab281---jedigaparubadu.pdf
    • http://statewideroadservices.com/clients/879378/File/35626548203.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/66dddd1a54aed352c7f3eccd4a5ba28d/18361136861.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/ketebexokumipol.pdf
    • http://standdominica.org/files/files/nofufi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=interview+notes+pdf
    • 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_off0000f3d3.bin
169b3e7edba64dda0d081839e97bd18266a1490debe02785041361b34ccc4b72
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 17744 bytes
font_01_sfnt_off00012215.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
font_02_sfnt_off00013a2c.bin
df67a4a709e087d783cf50af0fc590be07f99ba24c1d339d62159b745baecc62
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2C 10384 bytes