Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13ac12ee06c0831…

MALICIOUS

PDF

137.1 KB Created: 2021-07-03 20:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4309150e257dccc06687d5e1a6c25698 SHA-1: fd7eb39c2e8a182edadbeb954c02f9e9a2bd74b7 SHA-256: f13ac12ee06c0831a2e4323cce0ef7555da39e87fd301edb15af14dd53159ef0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f86810103a5e34f0e06f40a4e4a3d2ff/95033364256.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//45875309996.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f661a1dd---wolufozularopad.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517081330970586.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7d02841200e79ec516140157f2a856f4/16390391060.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a75a316a844132b62b57f417b0cae1e6/jonowolesekekizexab.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b606b55141c---zenelariveleg.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/lazibelebapuwobade.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/18f4188c1bc804d50924ccf90f5ff63b/12423674973.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d32425ab4c8ef55fb37917d954f7f832/15090826245.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/gigibazenime.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fopep.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f6ac6f75---zibedubuwisubebaxagimem.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/motekejibegesaralobode.pdfIn PDF document text
    • http://hydrem.ru/images/file/662310763.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160983ed5ede06---dusorupazegavanulesixi.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/sadolomiterevoja.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a47b0dd77---53663567075.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/41757828131.pdfIn PDF document text
    • http://allycatering.com/userfiles/jawidededopo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853ff17197b---gafafereduzekikojuforur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=eagle+middle+schoolPDF 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_off0001b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0B9 17880 bytes
SHA-256: 0739bd7c1df4495efb9a049539fa494e758f30b86fbe2563048368872d96f985
font_02_sfnt_off0001ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF97 10500 bytes
SHA-256: 450937c61812e0bc845657b36ef0c0170ff8187109029573274fbb65fe0d7b94

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