Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cc3c4cee777b39…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 08:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13ad7e271f2cc3cc35db02415def986c SHA-1: e23c05cd5a832f4103c9c1e49342122ad932b2a1 SHA-256: 82cc3c4cee777b394e21b7c1069484ecf0b8f349e3f4a5a0126d230e64f94dc3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dungcumaymoc.com/Images_upload/files/65347750941.pdf In PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/95895855984.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/eluvoliken.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/78582049377.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/99805249917.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/20610433417.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd717af73---7941953447.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/907f7c3a839e4119d864d214ff490376/zenivunivadidunopozepira.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/19566496190.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/95195548763.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/ladalojetidemos.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/wezidifade.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/gobiri.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/40515352362.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/xuduzagepibukewapurin.pdfIn PDF document text
    • https://scalper.ir/data/files/file/95327721313.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c13a0f76d---manogezepi.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/pagifopofumikalera.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/20719755201.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcc373eb8---23097706282.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/musiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d642768d6---xetozivoraki.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/xaxeduzuxerinalave.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/66550462317.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c26728345031fbee433ee6138796456c/35863748877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+auto+wireless+android+10PDF 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10580 bytes
SHA-256: 6d0ffbae3bece0e73af6b667795fa17124dc1c25e6232fd012617b7d2985cd9c
font_02_sfnt_off000109c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 17348 bytes
SHA-256: a71fbecb4de4270841fa4de4b07ce96bea2559e615e15c7ffd6d40d3fcf295c4

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