Malicious PDF — malware analysis report

Static analysis result for SHA-256 72719c5b17e54808…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 05:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baa7a04d9245d6370540f8213c6170ab SHA-1: 5d3d8df0fed9bc3970cbb36cc8ccf75f5a1b524c SHA-256: 72719c5b17e548085b22bc66ac9982af15fb08d713a7750a59145b2119dcceb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not explicitly detailed, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=century+ride+training+plan+for+beginners
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/41dac23ffa4b7027a457e038f025700a/56357353811.pdf
    • http://capmar.eu/userfiles/file/30874562605.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7e4759e4---26864935707.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/zimonoz.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0q399au499aqqgobphu3197ir0/6788587237.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/43cc4ce17ccf31fac89cd64d3b13cf82/76635676869.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090057c7e07f---39061504274.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/tanegenopi.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/jezujomunej.pdf
    • https://rajakeempat.com/contents//files/zekig.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gvmbrq9dfjebdvefckermk9hl6/42480204555.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c27d7e58fa7---69378119302.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a698e881f41---neduripiduw.pdf
    • https://ascinfratech.com/clientprojects/trading/file/14838920658.pdf
    • https://telewebmarketing.com/FCKeditor/file/saduzaxuzexizuv.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/musew.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/pnnuivqhe7o8nlrmjdvrhqnopt/tebuxemezozajatepivokir.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f6s2m0ssj9geob9tnnh59lf9l4/vorizavufinamigokevesij.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160764b768c279---kifiwa.pdf
    • https://dienlanhbachkhoa.info/upload/files/subowut.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ec581e11f02dc383bc9d8f003b3d430d/73573790483.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f8fbda5ec13a061d58079d14316dfea2/lidigufesuwutojor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f027.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 16792 bytes
font_01_sfnt_off00010839.bin
2ce48302052a2966489c88f8bfdf9064257cbd76f3d3b5d202daea0eeda44b19
pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 18244 bytes
font_02_sfnt_off000137b1.bin
72d1552289499a935a1ad6cc2df0d3e47c5cf81bda5de007544b4af90ddd10b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x137B1 11056 bytes