Malicious PDF — malware analysis report

Static analysis result for SHA-256 34010f5b59ee00bd…

MALICIOUS

PDF

85.2 KB Created: 2021-08-24 04:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd79e8df2d2d9196dd668bfc5d825f6f SHA-1: c199724f018e1fb07636c56b8fcf3c51c9ea9d45 SHA-256: 34010f5b59ee00bd7e497703287b59ea08f88bddf8883c25152afc76e142225a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to potentially compromised websites, and contains language suggestive of an invoice or payment lure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e82ed4580637b80ec72fbc0884e02960/91876290928.pdf In PDF document text
    • http://liccuza.ro/stiri_files/file/rilofojupemaw.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/cmscud100holnc3s56ige4iui9/44225881423.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/44946620269.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kupuzasebogijatovag.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/wevawosamixotawosad.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/25426527707.pdfIn PDF document text
    • http://minhanh.com/files/bufavixo.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/lutokodotepaniwusobuxivu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69eeb0961d---93115976056.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/ladepekijowevasenimuj.pdfIn PDF document text
    • http://abc-tel.ru/data/File/pakokab.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa7504367---30698000826.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d9ab18b7---gisidunarazarigizubaduwe.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/1619000708.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wakonomakeredafovaf.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/10123655282.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/66446757543.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/wizifuno.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/fubusif.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/kuferejoxufudufazabodova.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a59c3560---jofefigigulagiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=form+18a+general+tenancy+agreementPDF 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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16612 bytes
SHA-256: 857f7a2b5dab1c4ff97ef1714af5c0992570af427f53a62272f05d79c21e0520
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10664 bytes
SHA-256: c2299fd7b5a1007d20ecf950db2523359061be6aef31b6b2def7315ffcffa537

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