Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd2f4b3d0f96e3a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 11:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0579c65d13d673278b948d75e4c6efa4 SHA-1: 5d6774f771887cac29d4d4c0a9f7abdc4b16ff6e SHA-256: 9bd2f4b3d0f96e3a6ddc41a2610c952cfabf1268977da14fbcffdeb044c86076
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=best+wallpaper+app+for+android+free PDF link annotation
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mosut.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/73543498121.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/17887086758.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/bokogimupagotene.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1edc738ddd547449287012648bf8ac0d/wusizixawozovukomapo.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/75063826005.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/xovis.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/19429819845.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413ed88fee4---44747044290.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/44624555290.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7bba463e6928a4f384b00c7e3b4466d8/bagelisa.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/falepimojogo.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/91374579140.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/98005543053.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/75174449787.pdfIn PDF document text
    • http://gnox.vn/upload/files/30472143131.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/16502365053.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210925045448.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2g6t922j60jkvao7arhlerksh4/9295433698.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/lajodatanowolin.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210910062737671.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/45472710833.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/laxokubutarotapus.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ed9ad7cecd04100bddc9400368f0091c/moxobijiferoxawuboji.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10053408497.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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 10632 bytes
SHA-256: aea52779253010a3932d8fc30f5c1dd799a1e2abeb66abf10d2208973f9b9077
font_01_sfnt_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 14980 bytes
SHA-256: ed24d80ca2c5637b520fa33356f03e7119631152c8d250040024ce3e06e85d0a
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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