Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a522cc8b22426d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 17:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bae4cdc1a1934c588494463b001a3f0c SHA-1: 6d637745ea229b967f900628539fb020243c24cc SHA-256: a5a522cc8b22426dcb0a3bf24372aface11007e2a25de635e5af976f58ba60a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=navitek+s4+pdf
    • http://pol2-simf.ru/userfiles/file/jiboriku.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2bd8f12d50b06abf4c08772132073d9b/bamapuputorupekuvelofajej.pdf
    • http://inruho.ru/ckfinder/userfiles/files/14403591131.pdf
    • http://botosani.ro/img/uploads/file/29361399655.pdf
    • https://proia.bg/userfiles/file/guwojozusotizagetafufuxe.pdf
    • http://prinsart.ro/uploads/files/tuxusofafowoji.pdf
    • http://rc-mst.com/mst/_upload/files/ponuronegedo.pdf
    • http://sambometal.com/dataroom/file/vajibikekalejatimipeji.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/sepijiser.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/otfdb6k6923ch788idnr4vidd1/kelobuwolegokidobexuxegiw.pdf
    • https://ateliersmq.com/pevron/www/img/file/56346407732.pdf
    • https://shopinhome.com/ci/userfiles/files/tudisijed.pdf
    • http://gz-chengeng.com/uploadfile/files/91514306280.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5f0003a8---68860420483.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/nudulejew.pdf
    • http://luckysim.com/userfiles/file/49976015552.pdf
    • https://eguiders.com/uploads/sikabaleluf.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/44567302024.pdf
    • http://magendans.com/imagefiles/file/kumonusozagove.pdf
    • https://apskarota.org/userfiles/file/nivoniw.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/5947266219.pdf
    • http://beta-rc.com/upload/files/90573174556.pdf
    • https://lesura.net/userfiles/file/rumutatosuvozarajeniwot.pdf
    • http://poledance-chrudim.cz/files/file/vapulememudidubedefotef.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_off0000d58b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
font_01_sfnt_off0000eda2.bin
2a631fe1278c0ebf59606b61a1353e2a21ee4ece6ddee14bc8d1900ce05177d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 10336 bytes
font_02_sfnt_off00010529.bin
05ca4ddca0a300fcd8373da30a05788b4018d9cf9ccb9c614a1c2bac98db3b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 17748 bytes

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