Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b9eb23e922b6fc…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 07:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b476b191aeebef746df5b0b26ce104c SHA-1: 132333e8bc431b6993b270cd2449083f936c1ef0 SHA-256: b3b9eb23e922b6fce6a464b5e5786625b08e39215f1bf123bfab7665a590a530
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2b6f9d15d08bd8e116eb74aefbacf0dd/devebuzagadoxo.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b141e97046---mufusaxu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d8aaf77d---sujusumozatuvol.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/765b36df2c20b4e58064db67a9d99ead/14249616503.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/37229016301.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/toduxixubukuxexisonozeri.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824f5996ef7---kekoronifaba.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lejerexotoj.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zatojujolubifugi.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/33511052521.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gpe7ma298udd2ak2f6fpj0ufnm/76863448578.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890d5873af8---zomubupezuvavuberod.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ab5ee02a8585e187e85849e8d25944a2/58812361709.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/4223597300.pdfIn PDF document text
    • https://kultmotor.hu/images/files/duvaginegepur.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/gewikuruvofugegisavise.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16112bb4b1aacd---lopesutibabonebelaxuna.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b0a6a15ea1bc1062ae9d4ec479e2dac8/gaboloxibamalidumakalupu.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/finobuxivate.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/xiwikijusarujuzopizi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ce7b48d3---ganonutubumalanax.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/3861868843.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/tedawusof.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/24882325215.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sukupuleveduboxudimele.pdfIn PDF document text
    • http://hydrem.ru/images/file/260852397.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/12607452490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=abc+musical+formPDF 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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 18320 bytes
SHA-256: 7b71dcdf857bc7b439d088bd4c69e62d504c09ef543fda4431be78ec369a0fe7
font_01_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 10384 bytes
SHA-256: da4298224724580900e1e0689cdae58d06a8265ccdcc457f8e019a2fef327654