Malicious PDF — malware analysis report

Static analysis result for SHA-256 22819593c225bf2f…

MALICIOUS

PDF

74.5 KB Created: 2021-07-20 02:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9cfc7249284a26495000ff849224651 SHA-1: 3e72e675999f523a101564e650dce74e58398c46 SHA-256: 22819593c225bf2f4c2127e0bb51cf426182ed7f1a2dda236d9ab0e4f6ea901a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/up45g6jgdr13s6rn3rjrqgpn68/majemaravevurefaxojot.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/c5lj5399hgnm9bl6e8r58mpvq4/tokivemefukugavab.pdf
    • http://crescentcarpets.com/userfiles/file/jekolonu.pdf
    • http://andrelandberg.com/userfiles/file/zefetufamofixe.pdf
    • https://tecnicamistasnc.it/file/23895121252.pdf
    • http://labsshop.com/d/files/32391933303.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c485b311902---82904120491.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7c7a231e---bunetokaxoba.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b123d06f2d7---35327061175.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/32731043460a4232684575.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bd5858ad111a5d9f38d91dd7f3cba922/45107689088.pdf
    • http://www.520amis.com/upload/files/nigolimawidolomawewitotut.pdf
    • http://take114.kr/FileData/ckfinder/files/20210716_04296C8FB461B068.pdf
    • http://nw-line.ru/generic/uploaded/vozopura.pdf
    • http://edumedcare.pl/upload/files/80886311799.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0b7f6bd5bbc1d450886de6a6cf2d224e/15558417780.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/boxejegaj.pdf
    • http://hongshengfish.com/uploadfiles/2021062813073262544.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca11cb90a2d---65876162852.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1975054b8---jizuvewumuvufasuweked.pdf
    • http://leoclubmarsala.it/userfiles/files/59403772475.pdf
    • http://musorcentrum.hu/files/article/file/bonuxisokumakamomami.pdf
    • https://bloomeng.com/uploads/rajelikikudajisuwi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=selina+10+biology+solutions
    • 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_off0000c1a1.bin
e08db6958849058b47170b734fa47541c4c90f1de8b94a4c19fd726da90d9251
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A1 16312 bytes
font_01_sfnt_off0000ebbd.bin
24c165abceeb1144990b44a32ee616fa60a2ccabd47b76587cb24bc8db90188a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 10784 bytes
font_02_sfnt_off000104c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 16792 bytes