Malicious PDF — malware analysis report

Static analysis result for SHA-256 b097b508f0cbb79a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 07:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b3b8a4a3b3e455a87e994fe9725c991 SHA-1: 034e12160ac25b003a18204072bc900ce5cbff37 SHA-256: b097b508f0cbb79a0970514815a7922778659640e7f29a669876e31019b62828
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting sites. These links likely serve to redirect users to phishing or malware distribution sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136909d6afbc---suluxonenini.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/32386197186.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/7510312422.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/84594790098.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/36227352823.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/vikubigizizew.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090512081773499.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/visaxusiwitesitovid.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_053C353FA1685ADB.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/88796066229.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/45784766394.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/69648259697.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/bewapokifigilorewid.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/251c878d4b0cfc800e54f03a2b49e687.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_075054.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd9809124---89363872907.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395426d6e72---velorawajunokobekepugiz.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/mipejagaguvudibuvalapok.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/28633339302.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/52759124817.pdfIn PDF document text
    • http://koala-al.com/d/files/lefuxiwigunere.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/sopunagolow.pdfIn PDF document text
    • http://voijin.com/userfiles/files/fixujapi.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/tesolidikutinojemed.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/fusawudabogarixedizusugix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+bachelor+season+18+full+episodesPDF link annotation
    • 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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 17368 bytes
SHA-256: 0dea8729af8366276d084c3d43249b98a3e4a1eea685e559c9b90ea00ac5f8a6
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 11084 bytes
SHA-256: bbe700f5e3233f95f8ebcaed2f7d6aae67ef0d7a11b9784138886ea6912ad04c

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