Malicious PDF — malware analysis report

Static analysis result for SHA-256 611691d2740f481b…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 10:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b1573e0f36745618a105ac358a373ae SHA-1: 6d681a9deb47e17607f25f51b8077ae2c3d93ae7 SHA-256: 611691d2740f481b922a50cecfadbcf93b470c8633205a2892f783ef1ff89204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=poem+for+class+ukg
    • http://www.mmalappeenranta.com/tiedostot/files/gawanigewifipun.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c856a2bee0---45218758708.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e970bb17---72227492586.pdf
    • http://aucoindeshalles.com/menu/file/birewe.pdf
    • http://pritchardreunion.com/clients/81409/File/18557087490.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608917b18e6fa---timilazizelezix.pdf
    • http://aftckwt.com/uploads/file/36519999702.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e1bd67a5---19124667937.pdf
    • http://abwva.com/uploads/files/tumenavi.pdf
    • http://www.dafnimimarlik.com/ckfinder/userfiles/files/lejunojiwuxa.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c785817e3---xovudomabuket.pdf
    • http://peaktoppet.com/ck_imgs/files/59804461656.pdf
    • https://hoavily.com/uploads/files/55520506197.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/13f8084eff8b733ab6b7e6116517301a/15738757883.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683de1d7aa---xafekadajokitiroxudepe.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e75520ab---tadapeforiwosodawi.pdf
    • http://allasclub.com/campannas/file/72870361184.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a956156998f---53178581745.pdf
    • https://rubenferro.com/userfiles/file/gupab.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e6dee34d---4279878689.pdf
    • http://aire-limpio.com/img/editor/file/50095608628.pdf
    • http://newdimension.su/userfiles/file/bupaxovowivozojigom.pdf
    • https://atraba-holding.com/userfiles/file/48967341895.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_off0000f6d7.bin
27caa3c6b44338fc77a58787b02f5e38465d885f485a8345122a6aa0ceaf96f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10576 bytes
font_01_sfnt_off00010f0f.bin
4f9f7c42ce7929548974ea92ce332e07112dd921762a8c2a9ade3e157be4fcac
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 16816 bytes
font_02_sfnt_off00013ac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 16792 bytes