Malicious PDF — malware analysis report

Static analysis result for SHA-256 750b37d6e57fa36c…

MALICIOUS

PDF

87.2 KB Created: 2021-07-28 09:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d19ca153076e2f986f845e9416639d15 SHA-1: 3298231a71bc72dce22e31616cc4aeaa8018da09 SHA-256: 750b37d6e57fa36c76e764c1dd43c94c3434ab87c7330e9fcbc4b8e13a5b775a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://randalljroutson.com/clients/44711/File/34848414353.pdf
    • http://lateonsettay-sachs.org/userfiles/file/zefopuvovexob.pdf
    • https://viessmannboilers.ca/fck_upload/file/42380911792.pdf
    • https://baxsporthorses.com/userfiles/file/vajux.pdf
    • http://weymouthhighschool1960.com/clients/9/96/9679770cb43d952edac6f872f7aef95c/File/zupolepowusewifukunuz.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0dba9efa1b17c2b436eaf89b8ffe84cc/sosikuwujopex.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d5735da1---65277030077.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tmo8vpj0aaofvtrjb9chrlag7k/22343101428.pdf
    • https://washlounge.in/ckfinder/userfiles/files/rotum.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3c324c85---37278420776.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/37764515988.pdf
    • http://llux.vn/uploads/files/gozosemudadufukagumekat.pdf
    • http://01host.ru/userfiles/files/14924370126.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/14769386468.pdf
    • https://haysalon.com/public_html/userfiles/file/zojedodukufirikozifulovo.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/93028739201.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609016315071b---22177773942.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95f873f240---xotinuroxubaz.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16270744528776.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+check+blood+pressure+with+wrist+machine
    • 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_off0000f197.bin
c77819c9da25c1bc73c4a2a448ed590e98a2f0eb5f56e6ef57e8b7a3f85b23ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 11188 bytes
font_01_sfnt_off00010b55.bin
00229b628514d0f95a2dd9fc6b7e3183f85dbad538aa12ba04e88dbcb336efb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 16844 bytes
font_02_sfnt_off00013735.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13735 16792 bytes