Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bca1fb70387baf…

MALICIOUS

PDF

98.4 KB Created: 2021-06-28 22:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c98074d64f003dae0222f5c2a057bb8 SHA-1: 51a378a9c7733ff5ab9d6986358cb99a9bb4163b SHA-256: 58bca1fb70387baf0ba528771e18e0089a6e760cdf40da3004a2d1f9168023c6
196 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate it functions as a link farm and attempts to trick users into downloading password-protected archives, a common tactic for evading gateway security. The embedded URLs, while some are marked benign, are part of a larger pattern of SEO-poisoning and link farming, suggesting an attempt to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://bright-inter.com/file_media/file_image/file/60208527417.pdf
    • https://pypconsultores.mx/userfiles/file/sewebegagizojevixekaz.pdf
    • https://schmitz.cz/res/file/xakavakebula.pdf
    • http://wsm.hk/images/uploadfiles/file/pifiwabusunizadapemifiw.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/dff8141f1ad45f019fc99d344775d0a1/funebebilezulimamijuzas.pdf
    • http://bioscipublisher.com/files/upfiles/file/fijabibenaperex.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/v76bq50ecf3u7a1og3utdapvt6/49354984787.pdf
    • http://waukeganeast1980.com/clients/877304/File/94030400026.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160785d81ab6d5---72665226309.pdf
    • http://transsnabstroy.com/userfiles/file/89612828707.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8952bddb7---naxojupubimape.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/noremuzeluwifimilak.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/edl61purtqv34plfgpvfqo74em/sikusagisobozixuvo.pdf
    • http://normel.org/files/upload/file/98276357088.pdf
    • https://ebooksweb.net/files/file/26078047975.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c4c2faff---37375358035.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb8bef9fc---61787168460.pdf
    • https://rybczewice.pl/userfiles/file/20942590004.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085155f6a0f8---zugelojudarigil.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890a2dcb692---lubup.pdf
    • https://adepotcustom.com/UploadFiles/file/20210624161802199.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948991e3b94---22585592638.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d0f08428---51700992744.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b71410eb8---80868339202.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/644fe702e3bb5c5242674014f5e07e57/jivuxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=god+of+war+4+for+ppsspp+android+game+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010445.bin
72eb9f519ff6411885f1677b0d43ce6c6997fe2045027aad879bf698c67126f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 16240 bytes
font_01_sfnt_off00011a0d.bin
b64100effd24f0ded9af83e9c7e9d380a0b6ede376734572dfde5526610df2f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 18972 bytes
font_02_sfnt_off000149fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149FB 16792 bytes
font_03_sfnt_off00016212.bin
61ca8975bd91c99d3e4ba9d655840fb8adc0ed2192db3b5d0c67c00055f46d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16212 10948 bytes