Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f62972b106ec52…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 13:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a05c60a96c3a4e90235c87f8b5882934 SHA-1: 8b69cf4f1d85341a0d7b591281a5bf55e6273b57 SHA-256: f8f62972b106ec52f545746e8946c28569e8697f8f697b8e12cf3d1b97501a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=android+smart+launcher
    • http://oishisushigd.com/uploads/files/xokigusomemexijipuzudiza.pdf
    • http://frutapac.com/ckfinder/userfiles/files/85858627181.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/89826467006.pdf
    • https://lrsinc.co/userfiles/file/97229949398.pdf
    • http://kolbiko.com/images/uploads/file/nalufitozubofu.pdf
    • http://influences-vegetales.eu/assets/Image/files/xelotizupajawef.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/32143907388.pdf
    • https://kaowei.tw/image/files/20210911_201402.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cd1cddddda495cdfabdf9b3f38bd7dba/giwuwalozopakabujuxor.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/5524930815.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/mirifutafakanuvixiso.pdf
    • https://harmony.im/userfiles/file/pudidonejizinuzotasasesub.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14fe77161---letagifefe.pdf
    • http://www.deco-interieure.com/userfiles/file/73627313317.pdf
    • http://textingrights.com/userfiles/files/49617115176.pdf
    • http://heizler.hu/files/file/rerixifib.pdf
    • http://biaikatolikus.hu/files/file/kamolepebosimobi.pdf
    • http://wolfpackbasketballacademy.com/content_docs/83862117735.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/vimokaso.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/76958502303.pdf
    • https://mycocoa.org/images/upload/files/xeteninepirawomugabuv.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/89707670442.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_off0000e8cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 16792 bytes
font_01_sfnt_off000100e1.bin
b94518b23236c081c692808c6d02b9e57ce48b66cbbcb02d2bdbf7a1c3adcf7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 18500 bytes
font_02_sfnt_off0001313b.bin
4e005a6d05b786189be4f1b5593ae4f15b4e24fa5114c1ea6fef136920b8374c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1313B 10716 bytes

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