Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85bdeece6f908ca…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 17:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e4360e8f1914d501e0b0a0b0a416dc4 SHA-1: a10bb25b846aa6d46a02f11ef514e151d52473ae SHA-256: b85bdeece6f908cafe3c6059563f331e67f54b285f19964104e7bba006ef7382
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. The presence of numerous PDF_URI heuristics confirms the redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://megalaserasia.com/upload///muvorej.pdf In PDF document text
    • http://frankifoto.com/uploads/pages/files/kinunubojodasodi.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/diwarapuva.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/56025567473.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_075325_101.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/49189631616.pdfPDF link annotation
    • http://myappartement.de/web/editor/files/wofuzeguzusepixerejof.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/po7een6eaq9sgmn9f82hqb5m6a/22315004231.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e449d9e4c---maferemelabakikem.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/kumanepifagupe.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/74213165735.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/xebafidezamugurowaxiv.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/nepofejatejiwasef.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab7bba665---givawotexizofiwevi.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210921114618.pdfIn PDF document text
    • http://artio.pl/files/files/50122976776.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/76131458949.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/221d30c1108c0e7781afd6eb1d0ff04e/79164358077.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/65807976905.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210917065137.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/getisifumef.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///42576223878.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/40001829684.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/39604540936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+app+bookPDF 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_off0000afd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD4 15456 bytes
SHA-256: 6cf34b55f9bd4d9d9e83f78507da73bf2e567a6874d85c93601d2b64e2c6ed49
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 10156 bytes
SHA-256: 52a05c5d908e25665e56f777c8361619d5fdd59227b75ff8639cfbf5401dbbac

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