Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea088c5d41b993f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 07:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29ca3856385906bd2528d26d9a8dbaa2 SHA-1: 0519bb8a428d85257feb9b85ce53f14db572463b SHA-256: dea088c5d41b993f834b1dc822d2054eab17dd759c4c42d0da82ecc77b9ee909
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF containing external links, including one directly to an IP address, and links to compromised CMS upload storage, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mastervin.ru/files/file/33122971268.pdf In PDF document text
    • http://csp.hu/editor_up/jazej.pdfIn PDF document text
    • http://altus.pl/userfiles/file/27224636097.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/pofenibibomobogom.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/finajuvefemet.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/65149955337.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec94fc39aa---8422344679.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/8257332482.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/57709557614.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/14200757255.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/xibopopoxufonugidu.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/83646513697.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/23548915822.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/kugizoxabesew.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142573b77fdd---pufegaxajefogewe.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142995f5c36e---sapepujebukidavevanunuva.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/wifegoweduboniladigunu.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/zujazo.pdfPDF link annotation
    • http://linkipt.com/_UploadEditor/files/11982133580.pdfIn PDF document text
    • http://erpos.sk/data/files/57103657241.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/kiwozak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+record+call+on+messenger+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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 10788 bytes
SHA-256: ccfa2209bb8191fd53e2b31fefcb857ea6a1587dea92ebad58921e0b5c63949b
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 16980 bytes
SHA-256: a1c3782a27a75eee6600ebcd237747fd1b4e3ce64f6c81f9de2045e698c9a722
font_02_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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