Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e960e993696c3b…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 22:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c60a5673a4e7c62fc077f34a5525607b SHA-1: 0ccc238c919610dffe5024398115fc063844022a SHA-256: 36e960e993696c3b523e1f8bc7984cf3f54b4052b3a9498144e0832549c63950
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://ibb-online.ru/f/file/fenubebibefivekuwizupi.pdf
    • http://standdominica.org/files/files/39407162886.pdf
    • http://longvu.vn/Images_upload/files/muxudoli.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sggoe7s9kj86642si4b2imqrd3/9613087065.pdf
    • http://igabana.com/upfolder/e/files/20210601191041.pdf
    • https://zlatartopalovic.rs//files/bivukililupusuxuzude.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a512db81c86ab4445554c2b4f5df6604/tubisokavinirifawilu.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/80c919f85dabcb073b479ddd503724f3/digofopex.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/011c7133e100680d9c6986e5dac944a2/xafidemezufakodowu.pdf
    • http://allasclub.com/campannas/file/xipavow.pdf
    • http://apvn.info/userfiles/file/nulofejewafinewowe.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/kopozum.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dc12a75b---xoxinemedagopisojomutu.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be461788943---11399413181.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d5beaf9ece1d3c0dbb666e2603228974/tenifamitazuwen.pdf
    • http://palami.by/images/file/12318896430.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/1f286ad2bc57f2103040ed8352d277f7/lofavijo.pdf
    • https://emauto.lv/index/images/up/file/nipetapo.pdf
    • http://sun-green.de/ckfinder/userfiles/files/nibegilaramaxopiwosevis.pdf
    • http://actybrain-consult.com/Upload/files/xewujufux.pdf
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/mademabuzisidizopobufigo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=love+is+an+illusion+latest+chapter
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b9.bin
09d15ec488519159602089a4ed903c43ad53d449c040e9046daad081726b09e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 18908 bytes
font_01_sfnt_off00010adf.bin
7fa9ca838338309623edf6328a1f08eac7f486701fc03f4ebcc48257a70d3409
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 3116 bytes
font_02_sfnt_off0001178b.bin
ee42f507f5ad20c525278c9f3bb80e93ba00ed8e191788dd3afdc74cc8fe4ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 10592 bytes
font_03_sfnt_off00012fb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 16792 bytes