Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b80d64ddafbb97e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 20:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1758e8cdca74388f194401f67263eab SHA-1: 38fbcfd6363894533d196304157851a31b21f3f3 SHA-256: 5b80d64ddafbb97e94b5ce76a17b029e88653fd7a31f38d7431430ac05267197
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=ultimate+naruto+senki+apk PDF link annotation
    • https://perfecthospital.net/FCKeditor/file/nedasulakobotejif.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/juxipik.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/venorejezanikofiwaj.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210904211606.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/60560637023.pdfIn PDF document text
    • http://belv.ru/userfiles/file/motakufajefejokukipe.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/71521087187.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/30465528833.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/sejotuxotikezojutogadix.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/16624588266.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/kevuxatizep.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/losoka.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/tofaveniwiragisidukuz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1a488cac---34710973558.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/6205271741.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/falovaberi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c20865a76---liwosoxemiguzuwibolumanig.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/mavugurizinobasu.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/sotekobebilofijigejupalow.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/37851228656.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/ramopevanarun.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/linujebexukutisibo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kgnqofb41v9qu5hcmt75cq2hs7/94426737209.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/dagorodivi.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_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 21740 bytes
SHA-256: 54d5f83e1842546b6bbc09db76a00774e7f5d800c2a42b8973372e10d5ee3975
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10612 bytes
SHA-256: 49ef327a50c417062b9aa94945ead5a32f4835f576626324153bce740e9f86a1
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1