Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a3ad49523f62a0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 17:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9acf9aafb2d7ea366f91feb418151793 SHA-1: 1f4039bad838da381db39a572ed41dce23a083da SHA-256: 36a3ad49523f62a0203c21281a56acdc39aef9ae66043d203ca16682f5d28777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links indicate it is likely intended to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=advanced+millimeter-wave+technologies+antennas+packaging+and+circuits+pdf PDF link annotation
    • http://aarogyamedico.com/userfiles/file/rajenevafiwotakat.pdfIn PDF document text
    • https://buyafranchise.org/files/files/daterisoburerigexiwufetu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mejivexepakifurize.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c46954aa72---11301716897.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/domafe.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062012043697.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9f53856c5c1ce432e6c640310aa09bf4/51008323740.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02ebe8655---62327028413.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/96600497206.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/lutef.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fef0dd2dj3sq8eb68qojrnfduh/92556954807.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/wazoxufimadapupiwujof.pdfIn PDF document text
    • http://kanat.com/upload/ckfinder/files/93531214730.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/supimof.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p1bkmhdnltpdskc6rkuaposbv5/depuwigijug.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/vebebagiguf.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/lujilabudewifo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea4dab390---rukizumokibeze.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160da3e641f977---rozimijasupifu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/52a5774899bae6361657479c52830191/jisegodakudusiperukoduv.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/luwawutejogowawas.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qsk2fiph78akds99a38tdcc7o9/65218341847.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/10012455956.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094960e62e56---poveg.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/60213665572.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_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 17164 bytes
SHA-256: 084beaacde39636882a8e1c4d1f9d4153f86c01b10f33ce5741e375459d12796
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 11428 bytes
SHA-256: 0e1976b0d872f285eeeb0c3ce830d45eb81a2b83d32fa0368d6592a7e298e113
font_02_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1