Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d48142058dd7c2f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 01:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cda0bcf6a6c02e2f7fca0b47e548aa0 SHA-1: cc3cde94608bf8b565718d79245bd65bbd399381 SHA-256: 3d48142058dd7c2f0d8b5ad1862d7ef2edd5b2434ca89b1269886b6746269504
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, directing users to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to potentially malicious or phishing websites, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=ocr+pdf+to+excel+converter PDF link annotation
    • http://stylekd.ru/files/26324827293.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/68248395839.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/70737837196.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/minux.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/tidub.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/44622572735.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c18c77c---taroj.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68dbeffdf---21824343343.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/gezezataxikixeneke.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613760618651d---68540745296.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360ee48e42e---xuwerawudokuzevuzo.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/diwonutivisozeweteg.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/72fb386f877ab06658d81e009faa2a93/zatosimon.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337b5290f7---felozokuvorow.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/gobamiropi.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/rapamujoja.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/fibeminezalu.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/16238673153.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95767183009.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/pemegili.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/xisemejivotudukufikafewi.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/lomobu.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/81173797626.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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 16600 bytes
SHA-256: 09a565eb3e509f8434344ef6ff582f173f1d8fc0c9b1cbaadb38db5c4ca5ec47
font_01_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 10384 bytes
SHA-256: 50178c9dadd9eaf6ce550fadefc24619eca456a3d7fefa95fee0913c9e1b1021
font_02_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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