Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff7e021a92f8db5…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 03:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f447b027e9c65dea196115136f320a30 SHA-1: 3875bdafb36e9d207826515453303fc441726040 SHA-256: 5ff7e021a92f8db54627918ad3b75226d1b2685d094ba3d33345c5fe627ca44e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning attempt. The presence of external URIs and the nature of the link farm indicate an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/rlpgiqkodsrma19j2avv0lvvm3/24093322267.pdf In PDF document text
    • http://geoodwierty.pl/files/file/15460979297.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/48344955582.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cbspeefte6b0okr34mf34p4i78/zumuxawa.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qqreujnsj27fgoppdi9qn71v0o/zowasumedukufemade.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea34aace1---lunifofimivipig.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c5d413dc62329378bbe3eaadb953207/vetipaguno.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/43110078161.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/mabubepigabevi.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/rupurikanefokesexu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8f82463e40c74957d5bc0bfbf3421487/teroruxuladufi.pdfIn PDF document text
    • https://reniuved.it/file/61862884597.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160923f3b3458a---jowuboguwokuvezuxukof.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/lijili.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/29163802969.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0cea69f0---tudajuw.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b258e253---viboleforoparawonis.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1164ae54d21a26f97d48f6066745231d/xugabavazituni.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/97416769929.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/16946735019.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g915op36tp7f3k9eaavegn5l10/wepimojawuwapizo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/19649178447.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/30421667710.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/26522000053.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/pipolakororeginuvov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=percentage+aptitude+questions+with+answers+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8d7fa0a688903562192f823b5ea0ede8/lunurokeveduzas.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_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 18940 bytes
SHA-256: 56957554b79c8410d8cbf442255cdce248f5ac3e3fa159ea427dad58aeae8462
font_01_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 11188 bytes
SHA-256: 3f8abfb8e090c0cc149a90c2d3b5d9b09dc0a288f31db11ecfcccb3f7a75ad30
font_02_sfnt_off000145bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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