Malicious PDF — malware analysis report

Static analysis result for SHA-256 08551c6c3b010055…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 22:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2edcb60ebabe12d1f04573aa1e860933 SHA-1: 43a9ac705c2f0d2b65554246457a293d28d1479f SHA-256: 08551c6c3b010055f1a4badc31248b339f601e1f9b313ef45aee0b09fdf508b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fra2ange.it/userfiles/files/74152744069.pdf In PDF document text
    • https://mrdak.cc/uploadfile/files/pepepufalekaloniguxon.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/19223171566.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/dukaluwa.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/wubavisovebowuxinamarowa.pdfIn PDF document text
    • https://ccskin.com/geektic/files/dovapolewomemuki.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mijoludije.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8b51eb73---wawelakivufegule.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161392ef1a08e1---tegizekovewutejofijiveref.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/70735126919.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41c90245d---54438401677.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/24915609495.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/soxegirerijatojenawix.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/7432110824.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/lemiwopobirekusex.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907131238.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/12010555569.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/74280352445.pdfIn PDF document text
    • https://ms1oke.com/contents/files/biduw.pdfIn PDF document text
    • https://biocoils.com/img/file/tipewago.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/tojodamimazo.pdfIn PDF document text
    • http://potlista.com/file/files/ketapozepuponekaxo.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/83646021735.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/farajivujuvotanofepuvo.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/xaraxasojotel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+set+auto+dial+on+androidPDF 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_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 17220 bytes
SHA-256: 1b9ddfcf949d42e507edd4fe24d82e1c48bf50e078d6fe6d764dc90f3e161bb1
font_01_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 10416 bytes
SHA-256: 5029bb43db7da044fa58cf8a2db0752972793bd50af9d641500996d099ac2257
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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