Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ba135f516639f3…

MALICIOUS

PDF

100.4 KB Created: 2021-07-15 23:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9231df66a286121cac77359b82f291b SHA-1: bdf4e848688f61370c199be7cbb8647b57c1173c SHA-256: 12ba135f516639f3c46c0cd90a900d1d505eaae9e569724f694de948fcfe7bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature. The document's structure and numerous external links suggest it's designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808791169cc---84728793988.pdf In PDF document text
    • http://samnakthodrahassob.com/userfiles/file/pogimena.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754f482ed17---kisexojivikezufov.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/lgevbh9qd0t9pcd8pl9hf8knh1/64675775517.pdfIn PDF document text
    • https://eucolait.be/userfiles/files/69102728284.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607894172b1bd---vowapuzidufofozukabidiso.pdfIn PDF document text
    • https://mattress-leader.com/media/gubabexotikaxo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c01bb405bb46e35163a13531a1ec3fb4/64191059561.pdfIn PDF document text
    • http://turnyras.lt/Files/file/26581067935.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/94612721133.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc981e83---dexuwunivavavegeboboli.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5934ebbf0---puvulonedelejeluv.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f5d588b9---35930164943.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/rarogasumudewanuzoju.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e8e278cb27409216d563b9158382d409/91974847495.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/69784920985.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jekimag.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/6513989675.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ae04927a673122fd1bd848865fa5a3e1/35163701634.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096460020cd2---75799734501.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ff4653af1b7c3ff3ce100405bc5842d/28736219581.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/11689432278.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee4072c3d---74854646244.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ajb9mlmbcks5rm9b0ajdg1ee77/85217444844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+animals+live+in+the+amazon+rainforestPDF 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_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 10596 bytes
SHA-256: bf9bd4786ed47a1b68449ec467446348ea2bd72da7ec01283309cbb5b303dc4c
font_02_sfnt_off000156ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FF 17372 bytes
SHA-256: f4cf3326805745ec3383ed3b33e3dbd80e582ef898a4f275a334a83ede7e2939

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