Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a45aa1a2190d513…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 17:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c820f7e37396fee79887fab012d78ae3 SHA-1: fb0a66127849061af9ab6b160a6501c2771dadff SHA-256: 8a45aa1a2190d51381ed300470f65da4244e034feabf9e4498771e1a0825a69a
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 WordPress installations. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.novosib-sport.ru/ckfinder/userfiles/files/61193684412.pdf In PDF document text
    • http://magicfood-cn.com/files/20210912212607.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee15114616---28207744518.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/luwizabufubazewujuton.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sorovoj.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/gujus.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95e6eacb---sefemukidejitozum.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///55534971682.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/naxoberigale.pdfIn PDF document text
    • https://eniedu.com/data/file/20210912205727.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/wusem.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614031f76edc1---65113813967.pdfIn PDF document text
    • http://airfa.it/userfiles/file/93896017507.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2kulkqehrd68o0vvhsqfck0bum/26341329628.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/73599873342.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/weranowimetoke.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73561112858.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/2015608785.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/radusafifivemagasibega.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/49153522217.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16133961869fa5---93160365220.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/87777295688.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/begafidosawum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=black+market+app+downloadPDF 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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 10648 bytes
SHA-256: dcd1755fd1041fa97b7fcfd5f0381839b674b0c209d132afd2068158cc00a4db
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 18268 bytes
SHA-256: 29eee0865600316845ac6686bd13fd890c1a5caf3dfbc74e33e41037e2fcd043
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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