Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6f420937977121…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 10:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5112a6045e38f05b86822f5f0afac353 SHA-1: 4302a835534fb80a4035ae06a488c5bf1eff0908 SHA-256: 9a6f4209379771217018f1931a04ca4084eb86efe0f502945514e3cd500a551d
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised WordPress sites, suggesting a tactic to host malicious content or redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6619f0c---duximawimogukoguxox.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2aa67db36---tunenojudabep.pdf
    • http://farmaciafoglia.eu/userfiles/files/zedomafofovafipabexika.pdf
    • http://myucmas.com/userfiles/file/xufipagufadotogig.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevigakokubasuxejefem.pdf
    • http://euskararenginkana.eus/files/galeria/files/76051893635.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/10392461066.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3aa0aa84f---pamofegiduwo.pdf
    • http://pileki.com/imgup/file/19448693899.pdf
    • https://danielstrehlau.com/userfiles/file/57203694750.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ed876f270b8dcfc8d2c91239b5e632cc/84994464260.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/178b51ee6a8bd7d6cab1c3848e144e60/lugijef.pdf
    • https://mangonebike.com/uploads/file/20645784773.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/gilunifow.pdf
    • http://sudeoksa.net/userfiles/file/20210911052456.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/34910155319.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/96544590208.pdf
    • http://www.polni.si/Images/files/navomubipesoduro.pdf
    • http://unsersohn.ch/images/file/dobilarotodi.pdf
    • http://orthopediedelft.eu/files/jepelaruxeropugakopamu.pdf
    • http://grandioso.asia/editor_upload_image/file/42387149434.pdf
    • https://h1t-url12shio-turbo.com/contents/files/toxenagimisut.pdf
    • https://websbag.com/uploads/files/14202949216.pdf
    • http://allasclub.com/campannas/file/bewemononanatemomiko.pdf
    • http://duef.ru/public/file/72095806292.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+photoshop+2020
    • 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_off0000d992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 16792 bytes
font_01_sfnt_off0000f1a4.bin
7a87e9136b88ce426b6b7936ec46ecdd28607a3bc9e045dc3d7610a19fc5cd4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 18364 bytes
font_02_sfnt_off00012146.bin
c6cf1f1f7e6936ca7784b63b616889fcca7aca65bf052633144a41fc0a82b624
pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 10320 bytes