Malicious PDF — malware analysis report

Static analysis result for SHA-256 6874a9406ec52095…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 13:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffbe4c8e19e4bb598115db3319826cfa SHA-1: 570185eb68931023d5f92fcd5b9ed2c4ffa5585e SHA-256: 6874a9406ec52095beba297f1523f95ba01464f938df4d0fff08135e35948e9c
196 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is designed to trick users into believing there are new payment instructions. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://ketchas.ru/uplcv?utm_term=fifa+21+apk PDF link annotation
    • http://ghettaetamionarchitetti.it/userfiles/files/6247718944.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/mugolewe.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/54495498514.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/xasavokinevuwetivor.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/wukowevesigel.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/11582483173.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/3660954883.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/jumavewozujunoxed.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/83393264637.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/jeropotixitopetotoboruki.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/tunobutosome.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfefb65b54---22499954216.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613380986bb0f---dibipafepawegabegebo.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/bakamoragolisugi.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/77715764586.pdfIn PDF document text
    • http://schokofontaene.de/idata/13852348223.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/tifepugu.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/85431656291.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134085ab6b07---wobamaminage.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/9925041498.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jusilekerelo.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_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 18648 bytes
SHA-256: 98e0923c9f85841f189f1dd8676724c4a85ad98386d3393b3e265a6e736a1b3c
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 9824 bytes
SHA-256: 67ceab37165107486d7a8a99e1c751e0565686369c9422acfd9e765a40efa9b2
font_02_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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