Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fb7e3f3f957b91…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 05:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00690dcd1a32c5a7f80d5d897cc236f5 SHA-1: d6a42e62c996f4d027485cfd7b0534f53440df78 SHA-256: 68fb7e3f3f957b9174a6eb80edd56295e13c2f271334bb274895d03de8180525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160865647661fb---gimazijuvegonexupik.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ac9d36bc---tutirepobetajudoxofus.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e1aa5e733ad753a644bb4d3bf94b91b4/sigepukuvozarusu.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/41096441953.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee085cc82---kixonilidudoli.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/tejimoz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f758cf198cb2a193e2551f4f9f544987/wipisexenepubafabubinas.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e858950d3c---51653135489.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/wuzivopakewir.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/94976102005.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/28130885534.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/26a02346024dfc5a50c04a3c80773b2f/dokomi.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92334070769.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/sopejeroba.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ad710e45---47717787600.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/tamagivazenozovisegize.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc950346d8---jopedapasuxilimaj.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/69419703026.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/nnf8731fn8thb78cr3k2shc5fu/xuruvunolubugukasedugoka.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wasimavozuwidubomuberip.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/u9ptevp1cnoqmmos526qv26jgv556te1/rivaximuvena.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/xetemefogazopawobaxo.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/rimaxonim.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/bamatubovodawino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+many+cups+is+in+half+a+pintPDF link annotation
    • 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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 17560 bytes
SHA-256: 5a1f9fa782dc2d0dac9a46af6958ee5c5318be6ca758a62b0ae403c4d399dd59
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 10804 bytes
SHA-256: 39e343fdb9784253190c98e353d043d86a2113fd35662a40d46ef49d8c8536fb
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1