Malicious PDF — malware analysis report

Static analysis result for SHA-256 761be1a7b9c37a7f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 413b0ce5a70ee5052654e8015e759218 SHA-1: 0b7c840dfd912492b0c212c3a37ce12a397fc0c4 SHA-256: 761be1a7b9c37a7fc4f8f729c1d7b372993c6d94aa46f991646b02a84f2b82ee
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites. No scripts were extracted from this sample, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6686

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.
  • 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
  • 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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dfaec1f15579741626c1fcc701fddc67/88172174746.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd6c10963---4738236279.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210605_010503_7104.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0363f0a5ecd8d660c2a3b668443107d3/febidegajadifaw.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/33690039892.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f67af624ff3bc90c79d30c6ebdb84bf5/79825918119.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/92163571556.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ee118471---67654554850.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/14019533908.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/98668413332.pdfIn PDF document text
    • http://bronia.org/userfiles/file/laworunozofozilutila.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1g06ms1g6cugjflt655vh8grp2/92928318471.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb803b911ab---23261195433.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9aeceb682---75978223050.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/vetuvefujaximibezujibaf.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/xaxera.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a6bd29e14---42589472636.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/84352555561.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/589ef732a4497ea561779d384cce3c08/gitegugikaba.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160758d4857fe7---gogudize.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/bedipagorexubesaki.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/fosomumijusodetuduromevof.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gmi92sert7vqafgovlncbhfrhj/nigemigurobiduvodunexezot.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3dc83b9ad---80757625176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=perkeni+diabetes+mellitus+2019+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/83547043277.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 11336 bytes
SHA-256: 3b0f390c63e7f8ea9c85a340d682679d01bf90a303604ccc82c8ef06fb1c86f5