Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8e47775c140f22…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 03:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 796f1e457a0818fe3333029d11d70b96 SHA-1: 233a100439fec0f60d478c436bb1929460cf862d SHA-256: 6a8e47775c140f22d31203601460beead532dd87ef3d1cce2b0dd6375cfb1807
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=five+nights+at+freddy%27s+hw+apk+free+download PDF link annotation
    • http://ned.ru/uploads/files/26122048040.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/91291894247.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/xufuwamipizud.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/zedanenujiwagenoj.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/xadajilozirerusoxojifo.pdfIn PDF document text
    • http://knipia.com/userfiles/file/wojiluwebutulugatorak.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1061656936146b2adb438f.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/dimevuzavuzofaguvexetidi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91363280398.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/xotibefadozijeziwil.pdfIn PDF document text
    • http://ropesadventure.com/d/files/86369013764.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210901065813118.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf731c480c---10841685088.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/70135707949.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba28d873ed---simufadadezegizisasaxo.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/zefokamubonumupoxujux.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/93206448707.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/74ddcad92641ebb6f087fdcc2cebe053/gikok.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/58962661931.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/riduxumi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a3t0hk1pql3aovis8msnmghl7q/15655319969.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-3/20210903225119896985.pdfIn PDF document text
    • http://medrea.ru/upload/files/64858595025.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/lepoganas.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/34137677607.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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 11148 bytes
SHA-256: 66ef95ff0389c03d15149e3949fc8384dc4a27f7c85256e975fea854e3cd951e
font_02_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 17224 bytes
SHA-256: f9a67dfe9e660358f7d5851e095118991d4db833b092502a5e8f081f3b8a99a0