Malicious PDF — malware analysis report

Static analysis result for SHA-256 222fc7d84ac0ff12…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16514b059b03c6a6e6ff442bcb084e6c SHA-1: 67a708ee4fbd538974509ad270e00cca63ed70d4 SHA-256: 222fc7d84ac0ff122575394965904eec3036509ab086353a33fefcf9230bd9aa
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 embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to external sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://5thaveseniors.org/userfiles/file/38758688714.pdf In PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/33848ede5c67b3368d53d8f43a0448ac/didifokewizulopofadiro.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/11971981104.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/58334239628.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/maboberisanedule.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/76771795598.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b3344e31---werujegelaxisoxemufo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/t8v8k4u86bd7m85ka33vvp1pfa/wipafo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fsps3ijok151v67u0o6bbkr9q4/37238718687.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/86020300574.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/disujowabonifedizebagurim.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/1146186707.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210709_45D8102CD60BDFA0.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/30312852184.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ugm5m75i31lal8ecqsdg10jnb1/kotomukuzodase.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/tujesagere.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/86691187925.pdfIn PDF document text
    • https://landbar.com/upload/files/60358058962.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160897055ecb07---76783673943.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/13605273960.pdfIn PDF document text
    • https://ksboutlet.com/file/files/4333975567.pdfIn PDF document text
    • http://traviet36.com/upload/files/kumubexir.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/52595696283.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071462ac9f75---37369297323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lactose+fermenting+bacteria+pdfPDF 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_off0000c288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 11016 bytes
SHA-256: e9082557372246f7a3cf3d3b3b10c4e1231c765e4ced4566c003363b19c390aa
font_02_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 17704 bytes
SHA-256: dc9d277209d00b64739b51e98c175bc9fe2d0c793e086f61f0df0b4be3aada94