Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b0f8b930dea77d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 04:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d7f667ff1136f062f570ace8c17ffd7 SHA-1: 80fb5543b0ac96d28c42a5b2354cf0b429b7aa82 SHA-256: 20b0f8b930dea77d48caec1c0c8f04e3bb7f58508637182c2c49d7c601356283
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The document contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads, suggesting an attempt to distribute phishing content. The heuristic 'SE_MFA_LURE' strongly indicates the document's purpose is to harvest credentials by tricking users into approving MFA requests or entering one-time codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://allytemp.ru/uplcv?utm_term=android+backend+framework PDF link annotation
    • http://anhuishangbiao.com/upload_fck/file/2021-9-12/20210912134634330719.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/fitexebasataduxololetun.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210908_7F3ED4044A2DA28F.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/lisaduw.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07d6954c9---13384898199.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/9065379778.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/39199736922.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/82049125558.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/31062710290.pdfIn PDF document text
    • https://noventa.cz/media/files/file/11565061864.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/91979873108.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/14950886127.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dd97f3c081487947085e198408a4d705/64040892137.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/91671641265.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131588153c95---vexov.pdfIn PDF document text
    • http://topp.pl/_topp/file/1917137184.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/93056081897.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/27408324988.pdfIn PDF document text
    • https://anup.bo/images/files/21057317877.pdfIn PDF document text
    • http://amdind.com/userfiles/file/16851662926.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/29494709613.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/32069757535.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/94825428784.pdfIn PDF document text
    • http://dytac.hk/userfiles/80065700466.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/movujizafedat.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210918041428.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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 10624 bytes
SHA-256: 366648e3f818854664660158338149136d5915c9e3a72007a797a39f7a77f32b
font_02_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 18136 bytes
SHA-256: 465e0053a7e770018310c4ff13dad2b01fb8c8ae2525d378ee6e57f66ac2199b

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