Malicious PDF — malware analysis report

Static analysis result for SHA-256 44977dcb2e071451…

MALICIOUS

PDF

107.1 KB Created: 2021-07-09 15:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2773947ba3bc547bcc0622008e3e4875 SHA-1: faedaf40be2d719886def8691233eac345eb2c65 SHA-256: 44977dcb2e07145120ae75d1de09fa60de9c26f0bc6c7105e69645d911aa7995
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. This pattern suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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 http://work4shop.cz/userfiles/file/dinebanobivirujudonufor.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742df95dc4b---tizugevexalujukuwobuzu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210627034247_eg92os.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/521c90b41294f2e8839e39d737a2c7e2/posuboviwinudisukofuwok.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/642175d278eaf60f2629820ced65ae02/vaseruwuwu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea18637309---61292261167.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6k4ea949hjb64dof55nb5fk6p/dezevubapugugilujegoxa.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/44354836387.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda2bb750c---vowesunutin.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6285987e52---94089092784.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe3e72294---8758732305.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/88804404939f8665f0adb55e4ea7f215/puwoner.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0533dbdc7e---17255682219.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/telop.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/dopejelujigazexepen.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35988247959.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/26971595866.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e21383d9---66884186715.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b046a06bd---69055625380.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/fekop.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83477e6944---45068083343.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/dowasamofefemukiwewi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/llmmeeiss72mn8antp4rsc0035/jotekefebotoz.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/mejabat.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/fejisebilajefufewakojarag.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/62862414290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=formula+of+coefficient+of+restitutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off00014c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 21432 bytes
SHA-256: 21062be66d5b6133dbdff11c4869f6c63d23efa0ca3cfbdcee40df79f5db17c4
font_03_sfnt_off00018639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18639 10576 bytes
SHA-256: a90f1cb3906294bc90ac19f2267016e5b6a7e9ed44a0205cdd2d1971590c9e96

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