Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e81e1143a7b8ff5…

MALICIOUS

PDF

90.9 KB Created: 2021-07-01 23:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3bf6f23b06d1f82fd4bff27d66d8307 SHA-1: 3e911ae256d38100e64206441609e12e999c67c3 SHA-256: 6e81e1143a7b8ff5a5b14f17d765e6d4b966b505db889d1b15a279b8f8fd1e22
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, 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 sample's structure and URL patterns are consistent with known malicious PDF campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5c803579667e5f4379fa9bb09da7171f/fetozesafegegow.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4d22697b---97511914958.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/89440226574.pdfIn PDF document text
    • http://flgr.ru/files/files/52034338645.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5d849607---dizafisusenavego.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e06c427ea---17455622936.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e70b716da---10653900034.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8cscdpuaf74crrn678dp4ohpd2/70076090739.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/np2jgnr7u958sdopmcauso7omj/bazifuvire.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/af84f515d6b9ccdfeb102a05e130a1c6/lobivisudunukolafapu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a867d089e44---70724623273.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6e6b6f6aba44c2e2640d425c3d22746d/41378312199.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/09f9e7636be6f03c4d38bd0b11dc9695/takebuxufazosujajik.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d6976636ba3---gakilijavux.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f997e653---xiwevibupaxanebijato.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/29ae4469d5b42ed5cb3a5c8464dfd079/rabanazedasoteguwanop.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/8331287921.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb55dd6d5---85204021370.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/95360115153.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gvq9in1l35ihm7uadvuf0e699i/befipebowexipozivufej.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/76630329964.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/d9qenpcv59l8825795ro7e01tq/fosijemadaza.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/57462555874.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/litegim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+expert+table+of+contentsPDF 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_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 10764 bytes
SHA-256: decd640694831d0cd159ba8ace9b423d6c68e7556d28d0151bc4fef59fe01c18
font_01_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 17636 bytes
SHA-256: 94bd6a1b41527fef1742a48a5367eda881545bdc6a9bc65106b8961d08b6c6ec

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