Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6fa5df8b4a0276…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 05:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 008f256f34a2733dacba195677589004 SHA-1: 8cb612e0c0bfcb62da80c4253715e340dca051c1 SHA-256: 0f6fa5df8b4a0276f76b30326a38aa7b6674a65f9737762ac9d269e2e3d18151
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a compromised CMS upload link farm heuristic supports the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=what+are+the+coolest+apps+for+android PDF link annotation
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/10042097873.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/70048301232.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/9685014779.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/miwiwamorenonabibof.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/62566581382.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090618172219.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/mogigajoxetirifomaluved.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/jadozidet.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/68787145754.pdfIn PDF document text
    • http://stonebreaker.at/sozedutudeke.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/porunekifugorepa.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/wuwanoju.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109140605329638.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/2236787540.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/wopurabexemuguzas.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7c0b02a5---13667885926.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/45539147838.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/89452287603.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f244b2cdf6---wivivonumasidisuviz.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/14158814682.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/dixisefibobu.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/69222438446.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/57354794472.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4d2472ca4c62924e7af629857d88f4e7/76683648915.pdfIn PDF document text
    • 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_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 17408 bytes
SHA-256: 856106a0ac838954677bf21393a95b6a7c4c18b90e7779b78b2491d1fc98df59
font_01_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 10708 bytes
SHA-256: b8d7c01226a5efe3fe40e68d6bd8ec5a23129a6f80a7ada0b248dc1dbd84362d
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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