Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8e6d698058d54e…

MALICIOUS

PDF

84.4 KB Created: 2021-08-17 09:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc52c3fb0ad24fa114305f6b85498976 SHA-1: ffc572a30dd06260a4c6243f4894a7c2d61ee7af SHA-256: 5c8e6d698058d54e65d811033b9560ca99f493d8a3a88636dbcd25918328e601
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The primary lure appears to be a search result for sheet music, directing users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=pirates+of+the+caribbean+theme+song+sheet+music PDF link annotation
    • https://himalayanthailand.com/image/upload/File/lunozobel.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27938301162.pdfIn PDF document text
    • http://vejwun.cz/images/78943879536.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/96711379904.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10a6a75cbb---puletefumimalolusolasid.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tituritakugufuxa.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d40a3ee729c0ad4d111d4d56af6dffa2/10878642356.pdfIn PDF document text
    • https://fishuntpesca.it/file/sagabekezewiludemator.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1afb243674155711174fb6bd86946926/32229258027.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878acc0632---xowubuged.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d66a747bd71---vuturiruzitomugiwavulez.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/vejanomebifivaze.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf09f24a7c4---92092705558.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/19390931351.pdfIn PDF document text
    • http://teresachild.com/upload/files/81702457922.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7d70d7ceaa0a15afc350bb78435cdcb2/bavawobemo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcd317adc---kuwematuwawegewa.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wizizirazolazitofujebuke.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c145c9689caac9f25cbea9b00191b0e4/fidijupapepefu.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/8232014667.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7803b7667---togedisetukofutuzuraba.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/makigaxixi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e15a922c5649a89937c579cc7877c1d0/rutazixikuvikupiderekiv.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10980 bytes
SHA-256: 9dca851ca9686107e93b2e4106a6a95735bf1a7eed928dba7c8ba53073593c9a
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 17556 bytes
SHA-256: a145543b73529c5b0b09a4980dec5c6d0725b399c8ab64da30dcc551e9fdefbf

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