Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff308f075bf248d9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26b5e09c5967105c2f29350a458c23b4 SHA-1: ae50e983361a448f36d80af343f4a87d97c3fc26 SHA-256: ff308f075bf248d9948ff01d0ce30dd38d1ad66ae9eaf494edc8156f289a70f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing pretext, aiming to redirect users to potentially malicious content.

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 https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89a730846---zumopefamowupan.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/38bdd63a9d056237eb2ff9e87288871b/41934905777.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/f8ail8uae7l0qsne67tu4otq3h/wafifegu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/nofevuturag.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-3/20210803005051407620.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/64208f69ee8fd80465d40687c072afcf/zarazaf.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/luxenodefowazawodufinumi.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210716010112.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/nebatufumuwozafa.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/bazalepa.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/84eadff60e62cc8a370ec4fedf88b3db/37333979885.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/38066592311.pdfIn PDF document text
    • https://virker-ikke.dk/files/sidupizube.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612bdefd74dbe---64597807720.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/pufifonupip.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb61bbcc891---puvax.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095a72eef831---pefaguviginuromar.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/sozimefekokigeza.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/pibujigimixi.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/39572259729.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/55083124831.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/31005789461.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726acd1e2ee---gavegirizinasam.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a2b8f9b8711b2d4104960e99b10d62cc/59499343555.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/faa03fc4efabf6622989722b78251501/99146545935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tax+file+declaration+form+pdf+2018PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16888 bytes
SHA-256: c54e89484017491362376a581538385cbd21b802fadb0d116dfbdb79020c2c71
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 11180 bytes
SHA-256: 76c9770eea80530610aa4b89dfd235250fa4191db7303c77583dd43f5fc74c29
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 2064 bytes
SHA-256: 46b41152c66239606199adeeb56fa6f0c95586cce1373289504480bb8e1ff93d
font_03_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1