Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a80b8a55e2f869…

MALICIOUS

PDF

89.5 KB Created: 2021-09-14 14:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73d30c92c9b232072c524379c4a440ba SHA-1: 40550d25ebe131404411b58d6034e752edcff7b8 SHA-256: a5a80b8a55e2f86991432756e79e43db4ba0c0b04c6b91a4cf86ca45e497fd77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the link farm indicate a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://industrialdevices.in/uploads/49861182439.pdf In PDF document text
    • http://dogomanhnghia.com/uploads/files/tanijedowuxewiri.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/92697652187.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/fawigajimedujilepi.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/65447819542.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/gutoneza.pdfIn PDF document text
    • http://knipia.com/userfiles/file/62824223862.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54459303006.pdfIn PDF document text
    • https://oasis-travel.ro/files/busuvobuwaw.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/92342181199.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/71987131177.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/74307968043.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/53357173394.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/73648680250.pdfIn PDF document text
    • http://enkepharma.com/upload/files/95160563738.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132190b55008---61473304935.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8dcc036253776409b48bb74bf44adc89/kaxafiganakexu.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/bisafuxatuveworelot.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/lafuzitasuzuwodosubepep.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/rupunad.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/pumomagikekexinijo.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/27363617238.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/komus.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/kisuzezaluvugujitaxisoxuz.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tbsgsg0ird3lb0t865qk6us1go/84352018120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=open+kml+qgisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 17324 bytes
SHA-256: ee5732c31d4295012c45aeb7afbba7438a95861767627d427ed0f0d43f964df7
font_02_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 10376 bytes
SHA-256: e2d8caf5e657b49887e21b2712fb0c01741a61fa98c00276d2c50b040f851e81