Malicious PDF — malware analysis report

Static analysis result for SHA-256 7852130f06b6cd9a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 05:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8964a785426348efd7e2e999cd83b16c SHA-1: 51bcebb811c00a3ebd1e9706da737434d2e3c080 SHA-256: 7852130f06b6cd9ab4d99c908054be7fe28f4d1ffa85e827be2e7062360810b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0f2f50c27cea057acc7f39659601f362/9589279245.pdf
    • https://hosrem.org.vn/ckfinder/userfiles/files/sovukeseranoramib.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/zejulupomi.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6fb45722---wotozadisobelileto.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c861e65117---risapuzaberugozadu.pdf
    • http://kulturazebrak.cz/userfiles/13310879477.pdf
    • http://krasneclanky.cz/uploads/niruvipuzinaxizikedoja.pdf
    • http://zafirkort.com/uploads/files/53295453570.pdf
    • http://sostrevalli.it/userfiles/files/wokogejufegafisarij.pdf
    • https://magerp.org/upload/files/24434876200.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/5797337586.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/manopitidovinunalib.pdf
    • https://foundryindia.org/userfiles/file/magexeguzetawigosuxizema.pdf
    • http://apluskleaning.com/admin/images/file/43476994011.pdf
    • http://coiffurenais.com/userfiles/file/fizemo.pdf
    • http://tpokebar.com/uploads/files/77056612173.pdf
    • https://soalmatematik.com/userfiles/file/bevakutugufumubijut.pdf
    • http://jorkurojus.com/userfiles/file/nezobo.pdf
    • http://playbabydoll.com/userfiles/file/79746213161.pdf
    • https://citytrafik.nu/images/file/86326175051.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a276b1dd7a8---90543377610.pdf
    • http://wedding-ideas.ru/ckfinder/userfiles/files/fatojojekemaxugetipuwaruf.pdf
    • https://fotokeramika.bg/userfiles/file/57992230580.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/pawanofenorutukagefegajon.pdf
    • http://atol-res.pl/uploads/file/monav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=compare+and+contrast+stories+5th+grade+worksheets
    • 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_off0000cad8.bin
52ebc8763c87127e24b5c1b419139e164b4884af7774c1fefc9364cadb5ffe09
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 11260 bytes
font_01_sfnt_off0000e4ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 16792 bytes
font_02_sfnt_off0000fd11.bin
a200594dd1f222fa99eab7c39f499c5332d0a1381fb5df9e7673e57ecfdc4e73
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 16536 bytes