Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4113decf1a548bf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 07:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e479b779403a774d5e9d90dc9e004955 SHA-1: 9618be4273e4fcda6d6de3fd8e354cdf57c44e96 SHA-256: f4113decf1a548bfde62f4663353de4e2995bbd4811a15d3a3d3a3547f4bd6f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm designed to host PDF files on compromised or disposable domains. The embedded URLs point to external resources, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of JavaScript for redirection or exploitation.

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 https://drafthe.ru/uplcv?utm_term=android+smaller+icons PDF link annotation
    • https://galerie-louise.be/userfiles/files/wikagabepigedokeve.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/87704136444.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/depokudajajefizuwateno.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e94ff0a4b5101b4970d304896acf4767/gejiwujigokojegu.pdfIn PDF document text
    • https://chp-travel.ir/data/file/2671807441.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c3bf55524fefffe1fff3ac3f51eaced6/2548390072.pdfIn PDF document text
    • http://furniture83.com/upload/files/katozaditerape.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331dce721f1---vezuda.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/94640647733.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/94591375410.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/71063914820.pdfIn PDF document text
    • https://campermagazine.tv/public/file/gevotekemikarasupo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452b30e9b59---17150738195.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16137b0359323d---gimafewapowez.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/gowoxinejunefuzi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/40845800670.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/gijopifiti.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wugetigozenonodiwakowom.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/19109911215.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff700939e0---43466986129.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/32487481629.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/dozusipawadoduwaneg.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/45496600430.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/lubaxavij.pdfIn PDF document text
    • 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_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 10416 bytes
SHA-256: 30cd3fb1d2c1ad513f41992a0cb69edd80997f58940c81fa730dc27880ced34f
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 18544 bytes
SHA-256: 0646aea71d0dcdf2400a8c94ce4184b30a57ca4a7131c46097c6095766b91f7f

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