Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b98db00ea6ac8b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 22:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaef9c86b9748d3e61bb8d6aabc3ebef SHA-1: 0702171c6cbbafa6686fe6b1d0d125ba12419a40 SHA-256: 71b98db00ea6ac8b7e72b48e314ff9fa18372c17423b37f33ad49355da0fab54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bluebossa.pl/files/file/gozusizojifanitogavazi.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/xizitamot.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c5e3ede6f908e605baef998e7db726b5/xafivetuwixobosurizekizow.pdf
    • http://letsfinal.com/userfiles/file/10966735973.pdf
    • http://ambulanceservice.pl/userfiles/file/10627798642.pdf
    • http://www.77ice.com/upload/files/rirasolanadomozekin.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613713997db9e---kepebuvigutevonijabe.pdf
    • http://www.romanschatztruhe.de/img/files/74378142829.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfe3397jvnh89ev6hij2h7g9cg/67689853834.pdf
    • http://vanillasky-ch.com/images/files/lewukezixaloned.pdf
    • http://ingpiazza.eu/userfiles/files/tetirugafiluketana.pdf
    • https://weeb.nu/userfiles/file/12646270352.pdf
    • http://amirafouad.com/uploaded_files/file/xasatexunosezaset.pdf
    • https://patriciogaete.com/upload/file/tuwepanenevariluloju.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/kapagima.pdf
    • http://roletyhanarol.pl/files/file/zuvulifil.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/57870824146.pdf
    • https://sukaunited4d.vip/contents/files/tomimosibibolepo.pdf
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/bokiwuwagavogumupi.pdf
    • http://www.s4b.nl/upload/files/mimepugepeweniputemasivi.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sazabupara.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jinezotoxodituvetonarij.pdf
    • https://samsunyapi.com/userfiles/files/buloxasujigojibamazufu.pdf
    • http://traiteurluc.com/userfiles/file/90973984371.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+sip+account+in+android
    • 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_off0000b236.bin
0d8e79d93f4dc675f3bc2810efd9d5f867927a0566e40c523e1243090c981476
pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 10524 bytes
font_01_sfnt_off0000ca28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 16792 bytes
font_02_sfnt_off0000e23a.bin
a698230c8a945e1971c40f65c5041988fc30812cec105605f572fa2ada284991
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 14268 bytes