Malicious PDF — malware analysis report

Static analysis result for SHA-256 4438bac6ac0b9958…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 12:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e80e0bdfd1abbd72c52361a9db7f9c9 SHA-1: ca57ed51f8ba8e3e64d6983bab8f2f73b3a2e327 SHA-256: 4438bac6ac0b9958304a1124bf5b7645a3cfcbf9c1089757a181acbf098fc1b3
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. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161429b6eb5b68---xomogiko.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://holdemigny.fr/ckfinder/userfiles/files/33953323164.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f83618397eae4e2b483b34b5381c123f/dobowavupajobapali.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/wibanuwerafosarekevobu.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/puwara.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/74001679710.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/11019936473.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/710fd08ac91e9a03fd9f667a833a4d45/55089792166.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/zesalefu.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/47452080597.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109080753588450.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138651f98aae---7751556276.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/zozuralabetuket.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lazenepuwe.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/db2dce0f05213ac5c55ef0b4bf6eae83/winapi.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/vizidoliwefepowazodugurip.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161429b6eb5b68---xomogiko.pdfIn PDF document text
    • http://ifap.it/images/file/numufu.pdfIn PDF document text
    • http://quranday.org/userfiles/file/melofifenomezij.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/17190348658.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f2a88920---68841524270.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/16631231652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=outlook+mail+id+sign+upPDF 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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 17564 bytes
SHA-256: 86220c4d2fc64b81475a4d1049119071ed24f03f90ada19c82261b47876cbde8
font_02_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 10720 bytes
SHA-256: 88b50008a507fe0a8d2166339a7beb6fb9672d1940ea7d1f57c3b239aa412d65