Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc842473713d9a55…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 18:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f33ad1ac1b6dd539fa07e5e46e97433b SHA-1: ba7e7291887acc2007d8866b5ce675210a98f378 SHA-256: cc842473713d9a55a37d5c59f4125b2c4892d708273d08bb596ba73eb9041b42
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://kleiberit.ru/files/file/kifubesuvanipemuriguvipi.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b995665c---zeruvozanukonipimino.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/jorupefimosevita.pdfIn PDF document text
    • https://nasikampung.info/contents//files/79525282866.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086681aca771---82456326573.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a43575b4f609f5b7f711d1a2adb09825/8433151840.pdfIn PDF document text
    • https://andrejc.si/files/file/49294427188.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bisisililew.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b940a053938---xorerokusesuf.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e8302e0c---metajogebenu.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/59068523655.pdfIn PDF document text
    • https://termoformat.md/img/files/bojesisojikizewogumekopo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-15/20210815094235911585.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/loxetozobexukuzujogev.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d437f91a89---fufowovatigunomeke.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f980716d---53184985443.pdfIn PDF document text
    • https://telenovella-bg.com/files/bufirad.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/55200347661.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/91197727250.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/4495479195.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/wubiwuv.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/33363122180.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/kilezigisovimawagajimedix.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/luxunozotasotan.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/woritudutinu.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/zijafazekafikugineko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=newton%27s+laws+of+motion+pdf+answer+keyPDF 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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10964 bytes
SHA-256: 00f36386d52784cbe2731d4aec3470160357d6aca8eede576a43bc3faa20d37c
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 18012 bytes
SHA-256: 15f4f2dace5014273feb979f03112062ce24e9dbbfe9436501f71c551268c077