Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b433d93658ff4f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 11:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef0a3425ac3b993be302e28cfbaf499d SHA-1: 3a9212e22574ed6c82a08e4a9edba7f0879c7f75 SHA-256: f5b433d93658ff4ff0e2a4663d788e965dd3e7cb5aaa6c5773a0aa0597e1d7f9
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://astprom.ru/sites/default/files/file/nodosexatule.pdf In PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/ligumutizulux.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/metabimitazases.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/sugujilud.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/9643868382.pdfPDF link annotation
    • http://vitalenzyme.com/uploads/fckupload/file/rerodo.pdfIn PDF document text
    • http://school15-tyumen.ru/f/77047340793.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/50716049682.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/79817434350.pdfIn PDF document text
    • http://fpole.ru/sadm_files/xutemerotekopilus.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65540651119.pdfIn PDF document text
    • http://bluebossa.pl/files/file/xodefepofu.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/sijewunatexene.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/54662865015.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/rijubaxe.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/22377503512.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fca6cff1---mavaw.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/31756059458.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/24614211721.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/bamus.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090410150256.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/43909a9ee3718fbf30a758f1cd7c033a/fakukitesokozivagofo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a66ae816---kupuzifawalazusi.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/fobadasovepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=scientific+notation+calculator+fractionPDF 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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 18312 bytes
SHA-256: 960cc702bea040cf38976bce438653bf2a082bfe3bd65fa5cf3c8ca39406d38c
font_02_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 10336 bytes
SHA-256: a4c044d95c20a3b09e2d6bc7d9f11fdd796297b76fc47205cc4f279f8e720dc4

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