Malicious PDF — malware analysis report

Static analysis result for SHA-256 939c27f877ba8de5…

MALICIOUS

PDF

61.3 KB Created: 2021-06-21 09:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feecede34fb455b2786c9ec0f4e165c0 SHA-1: 75acaa1d40d963b7896247509b732fb1ab8e1e49 SHA-256: 939c27f877ba8de53b613572741c10f928effb83e224d80c9a6ea2e0f04c34a6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The primary function appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://victoryelectricalsupply.com/ckfinder/userfiles/files/gejuligesadudemoniw.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qtu4utk3tvuk6tr5o5meilio95/daxujetadabamekibifopo.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb1c3c4ca6---kowelakesazor.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/grc1vdk636d95kna1vvjulppjs/74868348831.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/02a750488fc2462defd75a1ed3c23403/vewopetevilerilirivolut.pdf
    • http://sl-light.ru/design/img/upload/file/dexupovuwebitepaxib.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea9ee5733---katixusajixobifopixepe.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a97adea36---23693657244.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160786b06422d6---94828091155.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/debb408cd475cd2f33594917e87f7e15/jedunuxevelumod.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/58f421af4b13ea3737a8f59f4b590dc3/lupawazepipoxeluri.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2rrvp3bc1bad4dsbapgg9icokb/78588716835.pdf
    • http://wintec-samu.hu/uploads/files/30219096592.pdf
    • https://implant-drill.com/userfiles/file/51530523499.pdf
    • http://omonetach.pl/foto/ilustracje/file/11779182687.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06ef49755---puxonisezigegesug.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c3b13c3f---12803088138.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hardest+maze+printable
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b573.bin
f0f3337f012ca5b98a8b5b8cb31205ffedd604abf8418df9c52b8328a776c3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB573 5256 bytes
font_01_sfnt_off0000c735.bin
ced447488e6e45d3fbd07dff0fc6dcebc640f03abb50cc323623fb41af4de752		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 9812 bytes

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