Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edc8a3bbe42321f…

MALICIOUS

PDF

197.5 KB Created: 2021-08-12 04:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a45e330d092d3bd96fd374a6e856a756 SHA-1: 1eba95453997d730924cbe7fc867cf3eb363f587 SHA-256: 6edc8a3bbe42321f45c5d22a907420cac04f063b6de424e6df37d41affe342c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristic firings point towards a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

Heuristics 5

  • 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.
  • 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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/668fb58893326314ba51767536db4647/91108243705.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c16ea18b---bapagazoligobuzenafi.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477817c5cc---20987790623.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/xulinaz.pdf
    • http://eva.am/files/011ff15c3f14593d.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d99ed4467---67099647600.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/h7qmmj8dje6thsg3sfmk495ou2/8108661302.pdf
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/buvozupopujev.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/fulegupoku.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u2rbtrisvr5rrdi6n9tmsrn2fg/fewerinuledobusufo.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/38886199082.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/9315197373.pdf
    • http://elitvorota.ru/f/file/tikoturekajegikene.pdf
    • http://sxhk365.com/uploads/file///23831754771.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ea9514b648dc0994a4aee736eef580f5/74394307437.pdf
    • http://actlogistic.vn/upload/editor/files/fepavuge.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160777a8418bdb---47235913333.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/3ieoojaq5t2elt8s1tpuag2se6/wafinego.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210616_07456EEF756B7A91.pdf
    • https://kawanmto.net/contents//files/dazoruzolumunodoz.pdf
    • http://traiteur-ribot.fr/userfiles/file/gogemelijefadegawepigus.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb07f617e8---23157143842.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608575eaa047e---38405871456.pdf
    • https://davidfoleyinc.com/userfiles/file/55926440108.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=eldritch+knight+5e+book
    • 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_off0002a842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A842 16792 bytes
font_01_sfnt_off0002c059.bin
d478c3d8c9eb65428472afba91f1e9a440a501dc174bb00b6f6c966d022625cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C059 10668 bytes
font_02_sfnt_off0002d874.bin
08a546e7d112dcdc6382d09fa3782c7c8eae51fef9ac7cdd1e07eca573d6fa87
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D874 18048 bytes