Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c688026746be9e1…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 23:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71eff8992417414d2fab147932782ebe SHA-1: db5df8355e661241e3ef6657979a27749d8ee976 SHA-256: 4c688026746be9e1d9feb5550fb932c0a010b7ec1eeb5944a28e119c1b66d5c5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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 http://alexanderkanevskyartgallery.com/clientMedia/file/zudofevuxejafuku.pdf In PDF document text
    • http://mosjob.ru/images/file/70707282258.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/89b3d4faabc9e619e04c06e6c58d7801/lesegokojofa.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/55014790622.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ce5b081e---63426123439.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/77772840247.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/keviva.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/42999483003.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/zerurulodezenokuxerebuju.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/72749800267.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/81224641025.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e06f4a417b0728235ffa2f75c8b936a4/fijoxazezoporopan.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/03bf62917357376e0ada63205795f194/58675196797.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/176fa99d35a862e65cf2228e902fdcd2/22762949689.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/59284366240.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f21d1090---logulawabozefogegiruvubaw.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068dfa82c19---kosedoze.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/7303773477.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b63f62b0a---4954860432.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/54079147742.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/66956230363.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611007d111966---vorapozefa.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/kuzenigegojizugudagarim.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5dc37bacf5198198b9af6e8e13ce38d7/fudevadelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=geometry+postulates+and+theorems+list+with+picturesPDF 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 11120 bytes
SHA-256: 70e392d72da458eae273a86291b906d95b708a5e4b82df806b08ebb0bf55c4ba
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 16832 bytes
SHA-256: afea3d708968d1c449a44eb9a2ac93665fb7094157531a59454dc7da0280d54f