Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf686260709b7759…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 05:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ecad519e9c6985a02ed6b2b93e7f1ab SHA-1: fb5e9462a26ea3304b56d9e6609718454045d993 SHA-256: cf686260709b775905ed08d5a7642434268eaaffee707faf4d3214faaba241ab
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=peter+stormare+game+of+thrones', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=peter+stormare+game+of+thrones PDF link annotation
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe47eded181---vofadejikipilibomimeg.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/15161352036.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/26239731208.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/52983893009.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaaa19e532---voranopizudijel.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/449aa3379bdf105eb23a6e9d7c990625/malumejopagagujinivul.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/dakovonapot.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c60e9c6a6---popowemedar.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/71963446620.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/1942fbe470956f66f018d295245f92d6/34466017028.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m9hj7ttk28o2j1f6o1l27hhbh0/86521689199.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c92567c98ebdd5fd84f3b07648d046a4/zugimulajadugetumad.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xemabidozogojixiforad.pdfIn PDF document text
    • http://plncse.hu/php_data/file/ropuxevog.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/76011262805.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/moxozaxoxikow.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160accfed02732---75374817728.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/suvamesi.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/37843018040.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210527231834101.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/zafexuwotod.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ed7795dc23a15e2591e4e8b2dfe09ad2/napidob.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/59113492310.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160807c465ce32---76011124093.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/zulaxixiwovenitifuz.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_off0000bc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8B 10524 bytes
SHA-256: 6a65e85ef86316f51f3d580734fa61d8ea3603419041538eceae10a9754cadbd
font_01_sfnt_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16648 bytes
SHA-256: 50b957346355a6d67b61b78c7385c92058d7952d71af50cf2d3c4ec7454c1c0e