Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3813ed86e99ed15…

MALICIOUS

PDF

89.8 KB Created: 2021-09-12 14:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2cee7cb791ab04a6bf14f52bb75fd27 SHA-1: 85d820ce5080416900407516dd3bf33b72264267 SHA-256: f3813ed86e99ed15a7334ad08c0647637cf4db9f930ec9d0a5195fb432987cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://reparationmobile.net/userfiles/file/33782397347.pdf In PDF document text
    • http://remont-etalon.ru/upload/files/29973099229.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/tufonabogomaxawebeb.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/55173256673.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/gubuwegajukitemidedu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/64390910561.pdfIn PDF document text
    • http://hak-al.com/resimler/files/31045047779.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/zunetevivofo.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/68294996822.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fd623cb34ba9400ea33577d943329f8e/75633993546.pdfIn PDF document text
    • http://topstec.com/d/files/79577171312.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/76579557185.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/kanozufamowakuvabo.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexigumegenuzebosejami.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387181d100b---jazexagowiw.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/paniwemeviwanipiman.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/63983975702.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/63382854833.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/24217054612.pdfIn PDF document text
    • https://promise-land.com/upload/file/patowagebakekoxegobo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/32845769916.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138829e80ec8---7759911226.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66772eeb3---9355594692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bomber+friend+downloadPDF 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_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 18660 bytes
SHA-256: c96eba6660eedadf8edb675bd5bf932f63f3e8e56d1f083f6a13aef5ac88169a
font_01_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C9 10528 bytes
SHA-256: 428d36608079c5bfe2f2591f19a43fabbc767b87ec570f52e6fad543db700442

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