Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc78ac79e413b318…

MALICIOUS

PDF

85.4 KB Created: 2021-07-05 11:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4365ffd7e503486c92acc9778021265c SHA-1: 7262462a11d087620c029fa390ef9c1162aeb2ce SHA-256: bc78ac79e413b31807f8b9ca8cefef6170cbcc0b8cdf28a57e37981485b2ca67
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress sites. While no scripts were explicitly extracted, the nature of the links and the lure suggest an attempt to redirect users to malicious content, potentially for phishing or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://szalkasszorutacskok.hu/app/webroot/files/content/files/foxumeko.pdf In PDF document text
    • http://pune-india.info/userfiles/file/40675123796.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/7dfebfa97398f3e01bff2be5e6294f90/20303699248.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/la9ifuqacqlh42tqnafqm28v15/gaxopij.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5529b355de---6627951387.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/29992881089.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b8ab825a8---sawemivunegedavu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a33bf8e4---pajujikefekila.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608048f3ceda3---fapirame.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cdakba6de1c8qf136jebfve3i5/56469603639.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/dokoraniz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607296a9d059b---vabelejupodasis.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/57921678260.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/3915fb2698566146eb89dfd29160d6fb/jivaxeriju.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/91895444763.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b84da07c5fb6f5933c4e31884a626441/75120704678.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf0c1c5da---tixibewo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416cfc136a---gisajinenipamodem.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073531420af9---13572645541.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/89734196055.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/8533349744.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/45654683881.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7c2fb737f---39021019892.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1a35a14e---87814792386.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jabiragigapofakesiluta.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jadojazizejomonedibezuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+deleted+history+chromePDF 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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 17428 bytes
SHA-256: 9ad5f380cfaf0df33512be71a1a7b1f2f4ba7641ef8430e90d6bd19aeb813ec4
font_01_sfnt_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 10772 bytes
SHA-256: cad365fabedb5095ca77846ae71725a5c6f846815b98dbc3c56390ed4443c0bd
font_02_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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