Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f505816c6ff2e7a…

MALICIOUS

PDF

103.7 KB Created: 2021-07-14 01:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e4b11a9e57771b14ec631230e7a9f6e SHA-1: 3eb22f30c1b4026c31c5755cb208ed07d1860ce1 SHA-256: 6f505816c6ff2e7aa949b45151877059ce1495aaa75f36f88f37fac47ba80eee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=how+to+combine+word+and+pdf+into+one+pdf PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c083503229c---barujudemus.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d8a916edcb274d12e677860f3c35228f/66100512956.pdfIn PDF document text
    • http://wamer.org/userfiles/file/1621369022.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c511ce3f003---82884117349.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/95352786219.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c119cf6a---60694410306.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c84a558da9c3ce46d443ac7f7209b615/29399226534.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b426d492b0---29771348337.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5055ec3841---noxolipuwuzexe.pdfIn PDF document text
    • http://guowangcable.com/d/files/gunosuwuliwomonaro.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/fivowuso.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f3cd3acef---32923508509.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821edf389db---bemowosatimiwolubimasexa.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/27896671025.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608500303a5f7---fakaxexap.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce639c842e2---lotidomodalexer.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/52903533914.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1580200c---mesivunexeriwezodewijan.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0f2888ad---70918073157.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/15846068639.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef8e15311---83576087626.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e73eff92---vedululiripawituka.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/64468858872.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/75291130777.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5a1a2e7c---vojaximibolaxotuwizi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d835254f101---55385452460.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/322815038.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2233d050c---43607972667.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_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 17648 bytes
SHA-256: b2b27ff86d7f62bf90f0530f22475fb2bb45c8ac464434b5f94b79484305405a
font_01_sfnt_off00016051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16051 10784 bytes
SHA-256: f738806b61210fab5e0fa322371f027e34e178142141e9b96f6ebbd92eaec935
font_02_sfnt_off000178e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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