Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bd677f05a514ac…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 23:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46aec115cb907e8b872a497dc2e53fc0 SHA-1: ccb0b2ee806386715b1a68704ef23806dac46a0c SHA-256: c8bd677f05a514ac14c0811c12a56b16f84b864543cc2aec5941bd658fdc5539
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

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 http://abbwingslynnhaven.com/uploads/files/32990399598.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dbvbv9bdlmn28t8l1cchcsool1/1718481241.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/63328027380.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/45715147877.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/tasativevegomowa.pdfIn PDF document text
    • http://cataga.de/beta/files/file/dajizividufi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/riwexuvaj.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jasakaregodevifuvisuje.pdfIn PDF document text
    • https://akconta.com/uploads/files/67482526027.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/dugimudifut.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/80116444092.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/17935303629.pdfIn PDF document text
    • https://peterdegendt.be/file/wiwul.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/12238061417.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/13464290597.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/soxibizukikavuzifu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2f1257d6---gozevezevol.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/dewimegitot.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/32353309787.pdfIn PDF document text
    • http://chongros.com/userData/board/file/20653049847.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/11745482821.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140baae856c4---34591438475.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2f362d3aac9e2a1c700b906666fd48fc/dugij.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/21584889559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=crash+bandicoot+collection+isoPDF 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_off0000b3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B6 10640 bytes
SHA-256: d5854e1878ed1379d6d0b8c0eea6a8c5515584f6bb20214eecb54cde764beb7d
font_01_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 17272 bytes
SHA-256: 4379a2c66fdda6ad26f9870d30109ad2e7c069f97726292af6354273a29faa0a
font_02_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1