Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0a34e01f34e430…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 15:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1913a58b96433bbace3f855bb4a204d SHA-1: 0b70a8cdf6e1a7c93414e9e0d035bc78168911bd SHA-256: cc0a34e01f34e430daccdf5314436e9c93f0f7f2721f2faf8c692e8b82a6a495
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://spokoino.ru/i/upload/files/96358390732.pdf In PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/kagoremolexipudapuroruxis.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/65082512239.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ca2b3a30---pereviwipojim.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/46019920291.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9bcd63eb91249b9b680a4567b7f8c82b/gufafekojinorogelafifi.pdfIn PDF document text
    • https://aayams.com/userfiles/file/21366024261.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/nawasitutal.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/fuluf.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/gimuvapagubosiso.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/75045480587.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jelowogepazixegutukomabe.pdfIn PDF document text
    • http://greenglobepms.com/uploads/gakavinizatupibenij.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/fususewiguxo.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/755856114.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614228b11ddb2---padosixosovazolixamovoger.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/xamugadodud.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/94570898800.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/lazexexifuxumar.pdfIn PDF document text
    • http://mp-journal.com/media/file/62037264688.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/tubiporuwi.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jevadazu.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/22079865114.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bujizifisibawo.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109072225502288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+through+night+and+day+full+movie+onlinePDF 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_off0000b88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88F 16200 bytes
SHA-256: b973499036dbf9ace9b481275e0a36cba7f23d01eb1623969b6c03b5ab363217
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 11028 bytes
SHA-256: d8c8b97348767b841ad43a118a4fa48d65f51e45e096dac26f9b9877f8eba814

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