Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2b1112eb5480af…

MALICIOUS

PDF

73.5 KB Created: 2021-07-06 19:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcdb88c9e34f7285f443206c4b9de285 SHA-1: c52851182b156a6f8e1ec1b1e33629bd0c36826c SHA-256: fa2b1112eb5480af001176a03e3f68c72ec9a32eb930a757145695879a41fe89
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, likely intended to redirect the user to malicious content or phishing pages. The presence of multiple PDF link farm heuristics indicates a pattern of using compromised hosting for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2d1a4c0ef1e93ecb89400f85b1f2196c/simopudemameto.pdf
    • https://agrilaui.com/userfiles/file/lofavawikutizeves.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f865b7243---4563889053.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/35b319623564f2e96c5d26e61bbcb196/24713946552.pdf
    • https://mszukam.pl/dat//file/xevipovulibatuka.pdf
    • https://nic-n-nate.com/files/files/letimebapagupugakid.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160cda07b0c9d2---11813797162.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088adcdd0fff---29411917254.pdf
    • http://www.pranabkumar.com/fckimages/file/dewekilewuvejowopibiz.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kesalof.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160780f913757a---83793186091.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e64b496d---84827139761.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ed463636---xodek.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/bewemaburimar.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/t7ucl0itdp2bcmgejlvakma1q6/89049106092.pdf
    • http://nwatchonline.net/userfiles/file/82032495035.pdf
    • http://longvu.vn/Images_upload/files/36497890686.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c8a6e0c4---66913512752.pdf
    • https://clubelsendero.com/img_pag/file/zanovoxaxagejopusola.pdf
    • https://2acontractor.it/images/file/dumufavakedeboguze.pdf
    • http://bilmatbasim.com/userfiles/file/mumemosepozirelisab.pdf
    • http://www.cerel.eu/images/wyswig_images/file/64176025585.pdf
    • http://kokocurry.gm/userfiles/file/25369713808.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lrs39mrmdi001p1giiong5mku0/fomexifuxafi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pdf+increase+contrast+online
    • 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_off0000bde9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE9 16792 bytes
font_01_sfnt_off0000d5fb.bin
c1dc655d139d7e1338f40b777e0f44544d1e89ed14cad8e75b0f55fb015c3c56
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 16568 bytes
font_02_sfnt_off00010108.bin
0483d300590e1a9beb28f48877085b92bd12a6185bc3ddb9a7d1c4a7214047dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 10468 bytes