Malicious PDF — malware analysis report

Static analysis result for SHA-256 021d4d7628aad15b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-26 16:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e6002e30f0444036e1e575049fae140 SHA-1: 27b6e3d373c5240b50a8a7ebda76ce1c4dc91a4e SHA-256: 021d4d7628aad15b163fd0d52fe141da763f8d9758a96081504ca943f0052aa6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=whateye+3+cracked+apk
    • https://divanich96.ru/admin/ckfinder/userfiles/files/87147054767.pdf
    • http://bangtutrang.com/upload/files/jemusiniwa.pdf
    • https://wemservice.com/ckfinder/userfiles/files/kewafufamonus.pdf
    • http://www.shjkyq.com/up_files/FCK/file/58175609608.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/p9no8k8cj3jivht0n5pp82kfc7/mokudepadizel.pdf
    • http://yomamasushitogo.com/uploads/files/razivurunewojajugogedukid.pdf
    • https://tckontrola.hr/files/vojakijiwokufozozudibe.pdf
    • https://bednidhitraders.com/userfiles/file/19261134186.pdf
    • https://idroilektriki.gr/files/file/32048692162.pdf
    • http://geoscan.it/userfiles/files/53565498147.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/62347478981.pdf
    • http://lexen.ca/userfiles/files/18032655598.pdf
    • https://mobilieroccasion.fr/uploads/file/munila.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/oadn0bbp3u1inbk0him3dho944/vejisunotonozuvugonevugo.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613819fb7cf0b---58236078882.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/85366093606.pdf
    • http://goraku-sangyo.com/userfiles/file/saxebu.pdf
    • http://orsini-blasioli.it/userfiles/files/tikoloxoz.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/92466420818.pdf
    • http://polins.org/public/userfiles/file/dozegavopegunaxopidox.pdf
    • https://aadharshilaschool.org/userfiles/file/64456519056.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/57553022678.pdf
    • https://doosradashak.in/ci/userfiles/files/40422098795.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/tinojikuzupevivuba.pdf
    • 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_off0000bf8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 16792 bytes
font_01_sfnt_off0000d79d.bin
3e5a8b890b297951c03d5988dd29f1edfe68d6e951687fbce8851d6d23cd2681
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 19112 bytes
font_02_sfnt_off00010950.bin
2f4a85427192d79d90b5e368fa54aac6abc3e54b1104bab9c05706c43054ae58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 10452 bytes