Malicious PDF — malware analysis report

Static analysis result for SHA-256 141b7acb6d185460…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 23:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49b4c62c8031d6734565b7832d610fd9 SHA-1: a4028169e9001efa7738c73a60f8297d0f7194d0 SHA-256: 141b7acb6d18546063129f3497d14454af29126b0bdd0f46b8fe311303878108
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, designed to redirect users to potentially malicious content. The presence of numerous unknown URLs suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a05f27ae---50206999794.pdf In PDF document text
    • http://ormansagszive.hu/upload/file/66926833622.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/sirowubir.pdfIn PDF document text
    • http://www.pvvc.cz/files/wadokurawaroguxuzuso.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/nepunopanujelugasepuvabox.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xipaxina.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/79874752965.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/dcd57e3bcd261598816aa9dcd649ad57/rirakinuxekipujumiteg.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wazalikomijisotosojum.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/54355568886.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130be1793ca2---tafaxezonodag.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/duxisumovana.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/viwezosatojo.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xupelupatejo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/17055202738.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d32588fb---60704259608.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/9933598067.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rs0k8u6rg93d3gm42u1br1kb0q/sixokawamanolar.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/vizutata.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/16990166924.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/48863115708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=acestream+live+tv+apkPDF 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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 10448 bytes
SHA-256: 653ecdf37bfd9b0647be9118b2defeecfc68e92e68926ef12076378394f4d743
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 17704 bytes
SHA-256: 721ecb88255b847c31d6021a6578cf85d69f9ef88a23a5ca8d66edc46a763629
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1