Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb6525caa7e5c65…

MALICIOUS

PDF

77.3 KB Created: 2021-08-27 09:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32475531f0397372b0367c38babe5984 SHA-1: db985db38845aad846f30bb274ac14a745001486 SHA-256: 5cb6525caa7e5c656466700387b1e5e869ec78534ceeebf0c0cc02ef1df49031
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. The presence of external URIs and a link farm structure strongly suggests the file's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://catamma.ru/uplcv?utm_term=sexual+intrusive+thoughts PDF link annotation
    • http://mariekevanvlierden.nl/survey/userfiles/files/46010397689.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/d2f058addd57f30ff457cdcb0ab726f4/pebasuvuzeguvunifijin.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/85172110431.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/fewezube.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/62384596146.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e279f6b859---44936549665.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kulewum.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gqeb16gkcardf8ndohd4jprrn8/ruxapinopevoromijusidu.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/8460172779.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/rl658h4db9v948su63pr6sg053/koremixisu.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/48714929140.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210728052722901.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/36640431542.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08e513385---dupazigu.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/44931799889.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/28e76ffbeb92286f56bf7673bc3efa13/zirizorowigaki.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tatol.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/pudamagu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/53o9psqf0vv3557d0rj0jtaglq/33534457460.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/didisovukedofulugo.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/sovut.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zuxugosigafepilaluwo.pdfIn PDF document text
    • http://yongqingtech.com/d/files/64323330410.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/polazodotigig.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102256de83---41781253151.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/93239231770.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 16100 bytes
SHA-256: 9c9c4b0bdb831927030f39f312939534bcc284d5daea1b885cffb0f9b7377041
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 10728 bytes
SHA-256: f77afcd247b10c2c553c4debc632817e0a5b7d306bfeae84a381e9a995dcf558

Open this report in the interactive analyzer, or submit your own file for analysis.