Malicious PDF — malware analysis report

Static analysis result for SHA-256 398c31920dd11266…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 18:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd743b48d4872b1abff166626213d489 SHA-1: a064bf542dfc765829dc5f54fbd69db74c9bab26 SHA-256: 398c31920dd11266a5bc53ef66c63ebc794bf05e5b976bd94aee3ee506608fbd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c33366be4424bd49d4839a734ec6872e/novogal.pdf In PDF document text
    • https://hanomanberjaya.com/contents//files/dakasipoga.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02286d95f---mezotujifogurafalexigarip.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/jogenibatu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d410bedc2cea06e7fb2140bbef07e216/36716142141.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/fawunuguleviv.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/22124848707.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/ligigobabobavudoputubu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d66cbed11---natudewanakideko.pdfIn PDF document text
    • https://netlandschool.cl/files/28642479719.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf51a2e3f4---71596619728.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/40464298568.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/zazuradak.pdfIn PDF document text
    • http://ruihuitax.com/files/file/retawubutinizaguk.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/nuzedapozivafelimogifibob.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90d54be66---47451261345.pdfIn PDF document text
    • https://btegypt.com/file/gajogokilifago.pdfIn PDF document text
    • http://veno2.com/upload/12768681671.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/jawuzukekiz.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/junamonaxime.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-22-13-30-11-91.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/12625893248.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/pezutowamoruvofusimef.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/14538799902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mil+hdbk+5+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50fd23704---16402732161.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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 17292 bytes
SHA-256: 04a513085402bd7118b95e0ca8bc6ec3692a6bb2cb3829b23a5c270c95bd7649
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 10072 bytes
SHA-256: be726b1bcad97b6add367a62ec25656fbe57dca74c221beeb2b336c923c49de3

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