Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b19aa718550632…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 01:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4f4e5dc2b45692d25e8a984e8e76604 SHA-1: 8d97268436d49322ec0c3bfdd18b649f7a731e60 SHA-256: d2b19aa7185506328b491f09a1def289e53983cdf3567ee44082651104263777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=julie+garwood+a+menyasszony+pdf PDF link annotation
    • http://koyomisushi.com/uploads/files/feminoguditakot.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/73997962151.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/rusivufosebanoxawegux.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd78248ae---6774695203.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/pekasexevagowapigezadowiw.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/jobigi.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/85556883978.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161426577ea15c---bawofizikebusesoz.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/47365843459.pdfIn PDF document text
    • http://dentali.cz/files/files/pejabuwokegijowemesix.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56988155087.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/67427571218.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d39c1ae000---jabemitomusufebu.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/waridewazinojad.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/48445220815.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/mifuxoximanibimobejuxuxid.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/35496571713.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/ferejinedenureketakamiro.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/tebesutibiru.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/35832793838.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/27498614803.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xozetevi.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/50212037034.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/fegepot.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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 11096 bytes
SHA-256: 9ac75c7e6db296df4ebd30e2faacc640e3abe898f7cbc6d3b5f77cca347f74c4
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 20064 bytes
SHA-256: 9acbb65d9c1a5048d10dddeba41319f60069dcb0a455a9104751bbb1c236c9ce
font_02_sfnt_off0001239c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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