Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb237df321956ccb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 10:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8fd291f15f07667d716211c4a56c998 SHA-1: d505abb2a9ef1330e80d32ca46a2739112b0958a SHA-256: bb237df321956ccbd9b37ce6901946e5561d939b11b0024622a8e3346332ad7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=how+do+i+turn+off+the+screen+overlay PDF link annotation
    • http://insfilings.com/skyzone_classic/upload/files/ligodevedapuxebarer.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/99310598537.pdfIn PDF document text
    • https://adikketiga.com/contents/files/14236656652.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614003b57e823---suxakapagidoriwuvaz.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/25065964792.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/berolopamoxowire.pdfIn PDF document text
    • https://nasikampung.info/contents/files/giwivojutikevile.pdfIn PDF document text
    • http://splogservice.ru/content/files/jojaf.pdfIn PDF document text
    • http://edituj.cz/res/file/40062009699.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/84835626079.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/kagazatexu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614138d78eaa8---65808904335.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/tidupiwamez.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/70492effbc8da3d11e34b36942a5cf34/xasonumugosaxalivame.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/zugatejolujisuk.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/40953849523.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/redudoguvozaxorijejag.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/xudalokejumibisepimabaj.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-09-10-18-21.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e85ece564---telakijot.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/gabajagovugadanubi.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/87773130152.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/85536287365.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/zaganuvodevu.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_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 18580 bytes
SHA-256: 9ef2252f9720c4a98c0d062d234ea8f5146ab1f06992e6a969bc2b617b9ba3f7
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 10932 bytes
SHA-256: d6c0878f5a83994db51be7aa42e8faab0e45fc0f2f2b16d5360153b8b1af03b3
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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