Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd96dd3f769eae92…

MALICIOUS

PDF

72.6 KB Created: 2021-07-03 19:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff8111fa99ed8754a5bb16ae07f9b81e SHA-1: 836ae40a6aafb0a130593d484344c1bbd7db04e1 SHA-256: fd96dd3f769eae921b237b00f0fd9331cfdb21b95903c8edd238479b68d0a150
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/393afe50c5e68b4e39d1be29be372dd5/58009948358.pdf In PDF document text
    • http://darec.sk/files/files/94974718014.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/webimafesinaxosijoj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dbe83777---76644790895.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081122c69902---24377849044.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/femidojizefagowuzixof.pdfIn PDF document text
    • https://spacio.hk/attachment/file/5242401109.pdfIn PDF document text
    • http://ge-mak.com/files/titolipopuxawafifegus.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/37015683673.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c262fba7e28---xowanobuduporu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/kobawitapesanonane.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/11ad0122cafd08823584f0cad18c918c/16087339458.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/21a6bc3eb77b3b893228ae9e1f7fe38f/sesegefovodonenu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/badotivebukov.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4204f0229ade3b4710ef877dce8b395b/xugovewadunoxiresutoje.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/70862364635.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/lakifolufok.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7ehu3qags7abt6r6o317iglqgu/85535074850.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074768f03caf---33744604487.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445d918090---79322389316.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a75537bf5206e31ce86618306ae0e8b5/23158028685.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7fd8e2c3---21307024943.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/vipuguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mba+degrees+online+accreditedPDF 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_off0000bd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 10680 bytes
SHA-256: 20294779c0bdc1e86695e75468b14289c0ec954678d6289483af673f3ad6474f
font_02_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 15432 bytes
SHA-256: a2037a645897a3e66145743c3e5c6348827193bde3108c040b520a110fa4670f

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