Malicious PDF — malware analysis report

Static analysis result for SHA-256 50707477e2eb66e3…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 00:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0516bd3759bc44488c1f6fb626f55089 SHA-1: 2d31faa5033d90c5b840e87c1f36663a155d8eea SHA-256: 50707477e2eb66e3003f8667de8b202ac9d78170b899893b41b8584dc78d58ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://barcabianca.eu/upload/file/75103070730.pdf
    • http://perles-del-beya.com/userfiles/file/84628705151.pdf
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/42616753357.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2ft5nrlu1s1o4js1j54eo3tlr4/xotagi.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160803fdbe872e---39256239368.pdf
    • http://remont-elektro.eu/archiv/file/94682873057.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/63a8880a954093b8b9370bfbf5129e8d/55313048427.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b1637574e5a427e7a5b09b639df0a122/fomisixevizal.pdf
    • http://aep-tc.com/cache/fck_files/file/201021511.pdf
    • http://apsara.ru/userfiles/file/91111003976.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962e6c50f72---69106963142.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cc445d9b87622eb522f0accd6520d8bf/buzefopugepigizujegije.pdf
    • http://akicgiyim.com/userfiles/file/likareto.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/eb7ngmlqtencqg0ivpjb1tg5ub/vopizanopulegepifumovoje.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/643cad67a7f0148b0b8e4e6dc52ba616/49449662985.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/241c12bb035f22d0209c2be03e815878/82173245701.pdf
    • http://pogotowienaukowe.com/Upload/file/6070884921.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fi962kle0hd3r687m6nf8rv0j3/16655955844.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3183827200---7481082880.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vvncoqbktnpggnejhpb8ak4n9n/33052577860.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ead6de1e201df571277518a3392ab58d/33770625764.pdf
    • http://redactron.com/userfiles/file/1342370325.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e656f05cdb---28135428628.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lady+on+the+bus+1978
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f2.bin
6437fbbfb5ff36fcc56e3b591255748c68a716fef38925df905fa66cc2c96f25
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 10896 bytes
font_01_sfnt_off0000fd2f.bin
8fec1f0e31ea75a0f5443b0af4d6e55085efeb531e84a6b5ced3f3ee836e7bce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 20648 bytes
font_02_sfnt_off00013226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 16792 bytes