Malicious PDF — malware analysis report

Static analysis result for SHA-256 708ece04ff98a83d…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 07:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d512d6101c60b976049c0651dce71da4 SHA-1: 3cecef5f7d1fd3c1605ce3fd0e81ee3ad3e639de SHA-256: 708ece04ff98a83d0678d8190176c5925a8eda345f08ed1e22d90549fd05d6a3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/nmgb0ud9o8f69iqt2fat4rsnfu/4350726677.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07a1d52596---13321308113.pdf
    • http://ohana1bbq.com/uploads/files/38527588383.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6h68k50fti2htnuubls8p73jn4/74561826450.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd7b96d7a---nozuwe.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/i3tsb3jbe8fs0mfrnfgjfr4gek/96223807343.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/aac5c1ae6ea87a31644b2cf7a6bb3ed4/filifow.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ffa02703---79523971171.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b1e22936a9dff31ab7fb1541b477f0f1/piwifimolikopetadev.pdf
    • http://hongshengfish.com/uploadfiles/2021052301520483856.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021617186423202.pdf
    • https://pima-alarms.rs/slicice/file/niwifuki.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/48d83d5b1c29233564ae8800ae97095a/bakasimajotonerebewej.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9e5ccb11---32839944907.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/35qmma74hpotutadthvsn1esu1/63685022073.pdf
    • http://banghaija.com/userfiles/file/53860322069.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/24467914540.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/1fk8gatpp9hhd84c4rfammskmf/77083211535.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6206f7219a47b708143abc45708d0a53/pibenetajixafoze.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a1b7cf25cafa8497379de0dd1ece6aad/warupomulotovede.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d7a0913b---mafolojefutabufelovare.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076890679962---85022163709.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/1808705830.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=benefits+of+npv
    • 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_off0000fbc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 16792 bytes
font_01_sfnt_off000113d8.bin
356537ef0673ba65ec7dea0f0ed1de667d83c6298e6699fe7bd91afb8f603c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 10164 bytes
font_02_sfnt_off00012ac3.bin
286cfa9dd91dc3e21b19c4cdcbb76471d5e007975997adbc0bae8a7c82dd1f16
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC3 16592 bytes