Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0a3f0ec8c3e6ae…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 02:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bba0feddd12b90c7007e9cbed95df913 SHA-1: 1175d138354c80620880e5e59f599643bfdfa89b SHA-256: 5d0a3f0ec8c3e6ae94187062c30cece936951638a03f689b8f2a143afeef922c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=facetime+en+android PDF link annotation
    • https://smartcrm.cloud/upload/files/60418751687.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cm8nb2a1cr2gncdovr1kik5487/76441768551.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/84d71ece1c176e4394bb0278903ff349/rudurizalire.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/24034403168.pdfIn PDF document text
    • https://bem-sa.com/img/file/84406388911.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/57769262707.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/fegenebonu.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210919014500.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/48911335016.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/37685743614.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/tufamapojufonimabafa.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/34193290501.pdfIn PDF document text
    • https://sinarwaja.com/account/files/55594389661.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260dcc2923---343036924.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/87967193256.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b825a2a9---58964485871.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/92179787983.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/25016282370.pdfIn PDF document text
    • https://produse-zilan.ro/files/94579769996.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/jujofugi.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210920_8516BEF9CEE6D1AC.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pesiwajufomedebidude.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/74226569417.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF23 10292 bytes
SHA-256: 166bb7e78a21dcf2bc88b7bd70cbea25ead23dda2066cf995653ef13ccb600da
font_01_sfnt_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 20644 bytes
SHA-256: 023ba6ec51b7a76a9e414b551304f933de9a64d7642c34964c40a34041cb095c

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