Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a7b6de6e258d92…

MALICIOUS

PDF

95.4 KB Created: 2021-08-18 13:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac6846ee56509adf34e49fd9169a27a5 SHA-1: 79b753902cdb2d1c65fb0be109a33ef97487b842 SHA-256: 93a7b6de6e258d92523fce521249babc5b3fc74c1298c9fd58d3ba22879ffd9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a payment redirection lure. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised WordPress sites. The primary attack pattern involves tricking the user into downloading a malicious PDF by disguising it as a legitimate document related to financial instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://lycee-elm.org/userfiles/file/97280565970.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dd33bd913---54542625971.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b47d3b0b---60172820873.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36fbbb2e2---tewemilakowojalo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f06ce47bc---milopedetofomopaw.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/fidosilafozes.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/24473661310.pdfIn PDF document text
    • http://sergeybazarov.ru/file/14946801182.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df66948fac---wigofi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/157705271960e50cf0880ae.pdfIn PDF document text
    • http://sjhtractor.com/d/files/14345173782.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/teperidujuwewubozati.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/82217274135.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5cd50531---timukuvojan.pdfIn PDF document text
    • https://premium-house.uz/images/file/76724138347.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/gezumaveguge.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/28189005271.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/fe340f209679d7aca2d82ac0fd675b96/lovejobobaxaxiwuxefob.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/xexukazazitej.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f0cea8d02---mogowukowepokadexam.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3a0580d9---26722854752.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bce8dde2a8199b2b608a4712381baf8/53087058813.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210511195513_53035670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+transfer+line+chat+history+to+new+phonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 10768 bytes
SHA-256: 2947b6ca35f4c372babf1b7da35e573833bebe8357c0c3f86ff94c424d103036
font_02_sfnt_off000139e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E6 16872 bytes
SHA-256: c1422ecd02eedddb1e9ba0640cd2eea5c79cb476a46982facb1b9a9b7286435a
font_03_sfnt_off00016604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16604 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae

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