Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a26e18f7bad7fd…

MALICIOUS

PDF

81.2 KB Created: 2021-08-08 19:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ca194eb3514d339c9193ab8c055f04 SHA-1: ba77043fcd6d5155bc643abf240aa2e3237ef5c5 SHA-256: 80a26e18f7bad7fd36a01fcbe3d4748c8f0c1de730b5115a9beb90e21b154353
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of these links and the PDF's structure strongly suggest it's used as a lure in a spearphishing attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=the+western+heritage+since+1300+ap+edition+12th+edition
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mghkmrolqtrl2u9d73p2q7cd8e/jevamu.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a48c8697ad6---jadukezarufodore.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/memutekosu.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa252764c5---ruzaked.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773900aab2d---72208440478.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed482002b---12373035587.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f5e037ae5---97146417827.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/e5ovuesiu8nh0gpv2lm20tvhnv/sopitaf.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16075dff157ade---8452957959.pdf
    • https://candbco.com/ckfinder/userfiles/files/jarizi.pdf
    • http://goldmustang.com/files/files/15923628794.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5d5bdceb8f4e4a7952196e8ee3a555d5/16742005424.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50d00752e560742e2bf74e43e583ee4b/73633328998.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095db812028b---52008727210.pdf
    • https://atcotourismtravel.com/userfiles/file/15752124832.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1721c7b174---58864656731.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161092103c1c1d---49220675796.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44f003ac8---siwerofexoted.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf62492f6c4---lopusinebejiboji.pdf
    • http://chemicalengineers.ie/images/xizewifazoxojaxivakej.pdf
    • http://greece-ex.com/images/blog//file/jovewafurulu.pdf
    • https://telenovella-bg.com/files/7481718813.pdf
    • https://www.passion-rnd.com/upfile/files/2021/06/26/22601629368.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_off0000d714.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 16792 bytes
font_01_sfnt_off0000ef26.bin
3f2d533f512ad9622ab37d24c3b5c0fde2adc5d1c28c093dd45c86e16a8217c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16836 bytes
font_02_sfnt_off00011b1f.bin
6dc958cfadbf097dea52243456975d0f5a3a1a2fbb1b5e60c306e429d39cdf56
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 11260 bytes