Malicious PDF — malware analysis report

Static analysis result for SHA-256 6319a70aeb3ac76b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 21:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3aefbece563060341ede82b670136cca SHA-1: d2ffc3c904d9117bebeae4d435a626ed3a121f73 SHA-256: 6319a70aeb3ac76be6229b052353fab81d87cadd51c2cfa632d78c0c1fe1ae60
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to compromised websites, many of which are hosted on disposable domains or use link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042ccdeb7d---revopojatusam.pdf In PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zinudusajiferakazikax.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/kizis.pdfIn PDF document text
    • https://alariel.be/userfiles/file/guxemeluwite.pdfIn PDF document text
    • http://santabruna.cl/upload/file/8058296436.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mekazoverunaniwekof.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/59014678931.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/vopidisivave.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109111106117378.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/90276943353.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wuxakevodeludebed.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nelovawiganixipujosid.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/26269460353.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/23352979881.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/673550353.pdfIn PDF document text
    • http://livestocktool.com/d/files/24408453431.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/29821072240.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/90164203277.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/dibep.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/juroturepelikumosad.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/morixagabobezarole.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/btj5kqm1c1cjs0548cvl443ba7/pezak.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/nemisesiralenaz.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/wimogatok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hsmtmts+season+2+123moviesPDF 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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 18796 bytes
SHA-256: 8776d2175340029c5824366f50133e9b6e4cd890585e052f78c8c15eb8e15aba
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 10524 bytes
SHA-256: 974b099505cdd96cdb354f0ae64ae96d52dfc25c06335ae6506149950e3ef392
font_02_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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