Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a73f4ca605f977…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 09:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a45a14e27fae8e228c7cdeba952aee89 SHA-1: 4a74140957c6525b6dd4a350eba344a71f10d135 SHA-256: 94a73f4ca605f97788832bd376f1bb76f0630fc4b1161d916cd81124e1720c4a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly suggests a business email compromise (BEC) attack. While no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to potentially malicious content, likely to steal credentials or financial information. The document body was unreadable, but the heuristics provide sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://redengewinnt.com/userfiles/file/nedamexadini.pdf In PDF document text
    • http://ladna.pl/user_images/file/nomilodopajetusowinuz.pdfIn PDF document text
    • https://limsurempat.com/contents/files/tofifeper.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/7705304441.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613317bbe3056---32386560145.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/vexutuxojofiwibo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613857e1e3809---wovuxapezoro.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/36807684278.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/pebazufizolumi.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/34932639156.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109030007212835.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/31756156648.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zufewaxemiwirafigifa.pdfIn PDF document text
    • https://ka-base.no/images_students/files/14529261967.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/89483642538.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kazawewonazepabebaru.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/34912152078.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918dab638b---80047349713.pdfIn PDF document text
    • http://gptools.net/userfiles/file/14645942123.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/14322968046.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/69029867585.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/87984245483.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/17971420482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wechat+not+workingPDF 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_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 17512 bytes
SHA-256: e7d11610b7b8c50a1510ddebee0393979b5b2b6dac1caf939668aa31806e0f5a
font_02_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 10464 bytes
SHA-256: a59205d1ee5b3635f7277d410ee94935217dbbd60aeba84d31cf9d3f2cfa7aff

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