Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cc4bf84459b373…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 23:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92fc041ec229595a44ed30008544a653 SHA-1: 2b7b6f13a8d99481ce379c104eeb346c669fbb68 SHA-256: b7cc4bf84459b373e37f9cbbc7fce61fef8a4d047e043c50a38aee8e2bdff84a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. The document contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=example+of+a+phrase PDF link annotation
    • http://yugang360.com/upload_fck/file/2021-9-20/20210920135232274218.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fabapojozor.pdfIn PDF document text
    • http://speckrepej.com/upload/file/58872694639.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/tizokumiwewuvorevusun.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/86543582438.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/84615107973.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d5058304fbc892f9bef73e4a836bcf5d/51402578993.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/668188581.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/nimogulipusamudere.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/19583227311.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/punav.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/27743355161.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/fakowixazaperetibeberu.pdfIn PDF document text
    • https://inks.bg/userfiles/file/damatofobuvukejagat.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/14563291648.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/tiwelosudoku.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/25895112196.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5fe7c164---37566313067.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/xulutid.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01d2dfde4---64298290957.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3faf6f3cb9edc012d5e3bd503a7c512f/sivexaraxut.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/bakimur.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 17916 bytes
SHA-256: eedbaac80238b6131c981d4141470657542a156d3a1ffb38bb93699223868e28
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 10416 bytes
SHA-256: 2b653e25ee1e70e167666b00ede6f923c0eec2d7cced74ca533ad4272372b0f5

Open this report in the interactive analyzer, or submit your own file for analysis.