Malicious PDF — malware analysis report

Static analysis result for SHA-256 046eb9ddc2b9bec1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 05:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 701012fbae41cc6b2529f375d0ff86d1 SHA-1: f2014e404aeb702456ead1ebeb1a55724afd66d6 SHA-256: 046eb9ddc2b9bec1334087e734840cc180906ebb0b63086bb0aea205288d2967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://zhfangyuan.com/uploadfiles/files/20018101617.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4506d226---feridoteradez.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/sugelarul.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/doreviruxejerotosobenuped.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202196131532210.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613de51ea170a---29840711309.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/76614788552.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/sudakoronub.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/lexasosof.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/71728144205.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/42572875717.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b8b36811a0f53944879194ecbe32d55e/nizuwisad.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/84756939410.pdfIn PDF document text
    • http://ombs.ru/uploads/files/xujupofibalanibalixedutog.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nanujagekaloragodepujo.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/23093661806.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/xetavoki.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/92954331702.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/36527785522.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/wined.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1d1a141173defbf13696e0db0e9e0f0a/71296989690.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/62b598e14c37b02314c6f96a380e5783/miriruwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=faceapp+pro+apk+download+freePDF 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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 18140 bytes
SHA-256: 23f56db45bfac7fcfb89943134feac09b81bd08c4883bee353ea28418c2ecc01
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 10408 bytes
SHA-256: 544df46153c892f543ffb382bfd8107e6afec329e2326c91d91e8faed7b7d3b0