Malicious PDF — malware analysis report

Static analysis result for SHA-256 723655aefe08b083…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 19:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1112ba718c3dfeac12bee1556b48ce90 SHA-1: 40fd7a6455ee5d5947148dbab088f72dd2a481f9 SHA-256: 723655aefe08b083f944c0bba9fdc39d00a4e4d9c948072f1b478862457ccdd7
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it presents as an image-only document with a clickable action, designed to trick users into interacting with embedded links. Multiple heuristics point to the document being part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bhk-aindling.com/userfiles/files/48453914414.pdf In PDF document text
    • http://onlinetradeshow.ir/uploads/files/varaxugewumek.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5e64d240c---kejibiviveveruwowu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gebegolemopizemusep.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7a63f128c746d28efcd0301a02219af3/mujinodulidavakerutarul.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27554606913.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/vevivudeperowosokil.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/jivapiguva.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/sabivewuja.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/xisaxizepujedotaxevawobaj.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae4404559---74464693839.pdfIn PDF document text
    • https://birudongker.com/contents/files/48176092583.pdfIn PDF document text
    • http://klhl.com/userfiles/file/bijitijerusapur.pdfIn PDF document text
    • https://clickbox.ro/images/file/koposawomozurob.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/68941461521.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/dabofe.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210901135304.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/melapeloguraduvunijozukiw.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/kigaxazosuzevoxovuvigulux.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/dakegizov.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/3399697417.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/22062241232.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e70cef30e---fimepowukelemakanesinem.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/14385439170.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/mejesinujafevuvoluvimis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hearthstone+ysera+deckPDF 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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 14320 bytes
SHA-256: b20f0f019d1ee7c6d9e8a0c6b7b3d109007711d6827963f101ac9591d8cd0429
font_01_sfnt_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 10524 bytes
SHA-256: af32fc2b76dec0cce61bfe4c43522785c8da1b042b79951be34b1321fc2d990a
font_02_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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