Malicious PDF — malware analysis report

Static analysis result for SHA-256 91175bd765d94cb6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 08:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3c9fa829e5c908f869e959005afa985 SHA-1: 87464cd9bd2a2db25135660e823972c0cf3c46c1 SHA-256: 91175bd765d94cb6fce8ad4cf9aea11fa18c0c12f59f14aa5a5a2fac598a8e13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=where+is+the+microphone+on+an+android+phone PDF link annotation
    • http://leskovec.eu/files/file/binugesuvelodifapuzif.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090811245269.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/kalopedolapokekol.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/53021567683.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3608b8485---xelomumiwurorovewara.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/25804277777.pdfIn PDF document text
    • http://carbontuning.ru/file/jivop.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/vunegonafawutikogir.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/bepalumibupalujewefukiti.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908074922.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/89459656332.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161352e74a2060---xokeja.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/29043015156.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/zaxagusur.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904101126.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vefevoz.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jikisumiko.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d1ba0185557f437fb4457678553f4ca/42765744134.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/toserovutupupenuvox.pdfIn PDF document text
    • https://umartravel.com/files/joponepugizorevarozotanuz.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/jumonelenutezoxonife.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/82220445033.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/52021637693.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/42051457301.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 10728 bytes
SHA-256: e429ea168b9b951bc14770d443a5427e7b4bb7107cd7fea7569ba39ec4438d04
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 17620 bytes
SHA-256: 9d3da4f6c70543cefd7c300f0d516965df9766271e4c4ccae5216c7ab58f2234

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