Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2d5de56974456c…

MALICIOUS

PDF

121.9 KB Created: 2021-09-02 01:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1cd0f2ba19b8b308d3d88a8cbae9e14 SHA-1: 5a4a9db93ae050a855250cf1ebc95d913a17f77a SHA-256: 1b2d5de56974456ca65ed9e028c5dac83f4bdfeee46f191f0a536d0e5ef34f04
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution lure through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://angelojrobles.com/admin_initial_test/userfiles/file/16318482529.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbd874aaf---tepizidumud.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/rarekixixux.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/11332133508.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161031a8fae989---sozadivepupisexonadabume.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/78884683488.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sufov.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/pifufawetowoseteniju.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/46121112947.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210528_5B7592E8D33CEE2A.pdfIn PDF document text
    • https://impresa-valli.it/file/lejifiwitefololam.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/33375203379.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/vokozi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nradag0rmcv1l0o9u8jphq0d73/bufona.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cc2249b1b421da6bf2bc8ba93d6ed967/85070186675.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b4eac39e---70914304731.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/ratemimolukiwosal.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/a75936cbc1788535c815a7b0adbe6a2f/26950772763.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/4034399176.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/38302867870.pdfIn PDF document text
    • http://prosquash.by/data/61491224094.pdfIn PDF document text
    • http://househouse.it/userfiles/files/lazapadugibuxapegujukuta.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/50539557697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=convicted+of+a+crimePDF 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_off00017880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17880 19176 bytes
SHA-256: 37920ae17adcab5ff530c74abcdda9b6031857d6f13661d00d6f4c782cb07396
font_01_sfnt_off0001a99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1B2 10520 bytes
SHA-256: 30ca817eadd988a1ba55f6b801c1f5984da68f7c0abd32dd0484a804d9c6be35

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