Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b97d6d871a8f74…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 07:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3be58a666f277d84b3fb042473f35901 SHA-1: 59651eb667236d51c7bfef9692f346b0f908e2a6 SHA-256: 72b97d6d871a8f74f3b965cc58ecbb512d199a1fea30cff16e6c1923dcc58797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://synerhu.ru/uplcv?utm_term=reversible+pulpitis+pdf PDF link annotation
    • https://sakkestadbil.no/userfiles/file/91408906188.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a753d64a338---1927748368.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9053ccb791---15086894289.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/rixaji.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f281151c5---91983642128.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097821845738---zirobubukinezobikuwitev.pdfIn PDF document text
    • http://turnyras.lt/Files/file/fozedotunuwewaluwikibake.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6cff27308e8bed4975ea3659709008e3/59754790241.pdfIn PDF document text
    • https://nexusmediation.nl/files/45037768895.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/160619266602.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdeb2f1747---xikusagupupagurat.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/396adfbb7af60cad93684ae71affeb83/vemexevudiparimegoko.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/da3a109437c215b7827c049fdd967724/dawomowi.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/77002973598.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/diwewodivabapomewaruruse.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/3531723056.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4d47cff730b8cd9fe7e6cce49ee8dd42/goparixilijiluroxoz.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/8058716322.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/68089681496.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/n55tktmmir6vjjse6ugds2en1t/tebej.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da2345c6d---95436564362.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/81550102962.pdfIn PDF document text
    • 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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 10456 bytes
SHA-256: 5efa77d64d2d579a1da4c752b0e9c75ecd7528386e0845aa0d6ccc99e98e8761
font_01_sfnt_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 17128 bytes
SHA-256: b516eb1170c19317be9b2329d24af3b0c717fd32ceaf0bf50b9cf176b65db4ad
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.