Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca18885d5225f5a6…

MALICIOUS

PDF

93.2 KB Created: 2021-08-07 16:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5c93f431956674237dd2845ea5a348e SHA-1: 9efa44b07bc2da46476b633cb832136a3431c0d4 SHA-256: ca18885d5225f5a69535687c080f1a707a8c62c121858799dd190aa364ee68cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://loca-granderoue-montaletang.com/ckfinder/userfiles/files/jimubadinulujilusavagujup.pdf
    • https://activepymes.com/pub/file/suxebofasivexemo.pdf
    • http://lenosada.sk/editor_uploads/files/60524844213.pdf
    • https://alamansyria.com/userfiles/file/ginuzap.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083d029012b7---mekazitevulega.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffca18ce4---tagesabapezodifa.pdf
    • http://lubrifianti-auto.ro/files/file/51596941947.pdf
    • http://bigband-ulm.de/userfiles/files/xipunubugelotod.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcecaec32b---zagexomumirapipen.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/14736742618.pdf
    • https://carolinevlieghe.fr/images/file/28092575706.pdf
    • https://ferado.vn/userfiles/file/sitibez.pdf
    • http://dianacb.cz/userfiles/file/99210967753.pdf
    • http://apexnepaltravel.com/userfiles/file/49677522601.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6153b654c9---tuxubipivoxafe.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/906ad52f25b7dc1c9600d5450fc70192/zozegozotu.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/15c2e41634e98396b128b8e690aea90a/xugesovukukomatowe.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a515c477b2---koliwazisinukinafelidepoz.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c86103012---wabutaxijafofetifof.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d89a3e5a8ca828634aaa3380f6b89df4/lorodivokexuwafovifoxewag.pdf
    • http://byty-pardubice.eu/UserFiles/File/15048552406.pdf
    • http://olgapolyakova.com/files/files/31888185861.pdf
    • https://banghenails.com/upload/file/22253265030.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=attestation+d%27h%C3%A9bergement+pdf+la+poste
    • 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_off00010376.bin
0928e613723213792613e5c6ea491d5afd6060e29ab169e360591c8cd56676cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 11252 bytes
font_01_sfnt_off00011cf6.bin
073b2bfe1316094c8d961110b87e425d27ee374e2b9b0c0c0f6918ccbe06cf00
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 18868 bytes
font_02_sfnt_off00014bfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 16792 bytes