Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1b0eb9dbf8ccdd…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 10:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ddfd3fc907f6a4f425716884f902b2e SHA-1: 3d84bf45e2bc057cf30b7bee5faecdaa59745b33 SHA-256: ee1b0eb9dbf8ccdd1ba0b2ce32f90696ce630774b5c551631a8e09d66a0b78cf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=psychosocial+growth+and+development
    • http://dharmapremipariwar.org/userfiles/file/lojugapelijewulisa.pdf
    • http://tobn56.com/UpFiles/file/vigawegak.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07c8fe493b---dolupabupirojesazaxa.pdf
    • http://nuitsdartistes.eu/images/file/wijepi.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210825105932.pdf
    • http://aylincinarli.com/fckfiles/file/mokukiwotokibawa.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5gh369q5r1je3grcqu0uc4bd9j/17622298582.pdf
    • http://timavoshipsupply.it/userfiles/file/27535381956.pdf
    • https://bravo-hk.com/userfiles/file/86926810114.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87c8ceebd---dolozinuvamip.pdf
    • https://hiroyoung.com/data/files/botaxakexugolofuzuxime.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609190e3b6c7f---25262120491.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d2c0cf41---26890579093.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8430000a2e---xevifigugizexajegikumaw.pdf
    • http://icltindia.in/userfiles/file/94545888673.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/91414603404.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a20771bf6---juwurupafuzenowaxexo.pdf
    • http://laxycoffee.com/upload/files/lililaxigamumenenakiwegu.pdf
    • http://angerdress.store/ckfinder/userfiles/files/98676648345.pdf
    • https://digireg.dk/upload/gamofezefabexugutuvadase.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d1eb95e63d76483f8225e508a86134a6/lulesojelafize.pdf
    • http://cutskytools.com/d/files/vazuvoza.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee40c0abcc---degimom.pdf
    • https://hazeloyun.com/calisma2/files/uploads/lipofo.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_off0000e484.bin
2ba748952388f8aebd3467b5d3bcc28f6fb35c154401780baed44da6654fe47d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 17780 bytes
font_01_sfnt_off00011170.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
font_02_sfnt_off00012987.bin
8abcb6ec65d21cc1e7bee270339b3e379f591f60211e703ef93592f3514aeba2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 11228 bytes