Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbc960c8849fe09…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 16:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac829d4063d6390c2438bc4d6ac8fa29 SHA-1: 4f1a265b457a52a1f2181d90c3ca3fee47074446 SHA-256: 2cbc960c8849fe099f9b7e72e0472b89b943a5b57f1055ebb5c36a5ae77a03d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's used as a link farm to distribute further malicious content or phish users. The presence of these links and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=how+to+see+the+wifi+password+in+android PDF link annotation
    • https://aluminiosarla.com/userfiles_arla/files/2855394376.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/62552924231.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508236a1934---nepulezunezafuba.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1054994676dd57c4ad1200fb1f4e9154/luvilavodoloborakope.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/mulasojujepobojamedanotud.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/lilopepemopipemis.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/2326558205.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/90664710359.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/64548933559.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149751e42f61---72256912274.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/budatud.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/jixolise.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/devilatevixu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-19/20210919153329668153.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/eafe1a89fa3aab0efee0441c7d5666bf/kolepukubi.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/93466556885.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0cc8f274---76170673944.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/ziwovokinalomomer.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/kamunokisoki.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/pigowufirowoxinofi.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/68560891381.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/bawamolepomutab.pdfIn PDF document text
    • https://kultmotor.virtualbodybuilding.hu/images/files/80730990277.pdfIn PDF document text
    • http://isvpro.com/custom/files/giwinofumu.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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 17100 bytes
SHA-256: a4221f1a5b666cc1ae59c45c9336df7cf20d0b4c47517f834d7b945c21f90e4e
font_02_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10628 bytes
SHA-256: b50ce5747641e98458d8531fb2d966529720ba54c0f310f8d7452ce70aab139c

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