Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c98ae3f6e11c8e5…

MALICIOUS

PDF

88.6 KB Created: 2021-07-06 20:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b448ada623d2e2ea1ddf6efcc88a9327 SHA-1: 0fd21d7928dd4e4e6501febced34f88bfc3c0644 SHA-256: 3c98ae3f6e11c8e58660c3fb8a3d8397477d50045f43d573d096ae5eecf7bdd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of external links and the high heuristic scores point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://synerhu.ru/uplcv?utm_term=where+to+learn+how+to+drive+manual
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c1f30643c---31267101151.pdf
    • http://magogaralbamoble.com/galeria/files/99115042736.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/q2ajn0jpk3a1m7k7q5tni0ut5a/lewimivetavap.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609de714b2336---luzuf.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bb42b057bd95b586362be3877ca3a4b7/xuvizamutulanimadezajin.pdf
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/9091231562.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/84484681370.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160be6bfb2dccf---tesutuwivuwigusubo.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b0492cb6---bireturowu.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/68d36adb85d27e8de225124f35eab9c1/98229215355.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609251b706288---44316639392.pdf
    • http://solee56.com/ckfinder/userfiles/files/nogajulutunuju.pdf
    • http://cncforginghammer.com/d/files/78158817779.pdf
    • http://malifer.hu/upload/file/suliwekekofuxitira.pdf
    • http://metabolit-plus.ru/files/file/58757071201.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/44da2b3c192b7e789ebb2908efb79f84/mumigixemeledu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084983c13d85---93604766067.pdf
    • http://apsara.ru/userfiles/file/43586772142.pdf
    • http://hainescentreasia.com/images/file/vezubelo.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/santgehjobjs48vkopu819dpeo/67351694332.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da325e172---69863690417.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/mqhpks7nvnauctub6jngasckco/jisobomawuboxirobufuzog.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bd37e6e045e50110970ea2931637e237/25083733544.pdf
    • http://svsteinfurth.de/radsportfiles/file/10664017038.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c264a3cb218---68978318575.pdf
    • http://learnersdigest.org/userfiles/file/48414385518.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_off0000f94e.bin
c4adf4695cc3417e836bb167c617577e5eced19b266424eaad96ad22ef370ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16804 bytes
font_01_sfnt_off000124be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 16792 bytes
font_02_sfnt_off00013cd5.bin
6b165f8d9e56a1a7c4a399e956b73e406ac189bb1ae2413b8cfbabbbd5d01629
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD5 10588 bytes