Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d44086e9cb75bd…

MALICIOUS

PDF

76.7 KB Created: 2021-06-29 16:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31e43ec002062f49cfd45f4999607287 SHA-1: 77be167c02313c92951e58bb6e657031dd9b87af SHA-256: 68d44086e9cb75bd7713be11282ebf9481c8551d5b970c904ddad2d90f276118
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a6c421d05---pobasugejirokoxe.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/26521384943.pdf
    • http://dynamic1984.com/user_file/file/kuguma.pdf
    • http://niezapominajkowo.eu/userfiles/file/fixovenag.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4feff9859a---nonewufawojomeso.pdf
    • http://bangdientunhk.com/upload/files/99125413120.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf1380d08---59104527992.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a515251e3---52923749973.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/3jhq34nq5jei2bi7d8p314r987/rimozojixujoni.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83f29c770---81840322654.pdf
    • http://vo23.ru/upload/file/86377048386.pdf
    • http://guowangcable.com/d/files/76894059265.pdf
    • http://championsview.net/userimages/pegixapevowugifew.pdf
    • http://fixafilm.se/userfiles/file/fejigugotomeveminafiwu.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/22598293971.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0acc9685---xorex.pdf
    • http://petra-dario.info/upload/datoteke/68136238029.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/e2jqi15at1h6chofdjukh0kv76/94771937197.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3ngj09an763auoq80b20p8umm1/30926810967.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48c69c0cf5---nupini.pdf
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/bajerutopevet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=phyllodes+tumor+definition
    • 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_off0000cad4.bin
fabb323da19709caee1302baa7c7face0bf754133e023902b7018c2ee35fa92c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 10672 bytes
font_01_sfnt_off0000e314.bin
c1492fa3ffc3c6e42bca2db6159dcfeab73c8809e9a6d3bc07cb3a8ba49ed2cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16360 bytes
font_02_sfnt_off00010db1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 16792 bytes