Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83c97fc5183c2c4…

MALICIOUS

PDF

90.2 KB Created: 2021-07-28 04:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e006cb74a143e01b31fb0ffcce92ef1 SHA-1: 8c70efeb4814eed0325c09da7fd62ec7e4096aab SHA-256: c83c97fc5183c2c44c6d1f9c06710bf7988ca45f8d97af029afc3d13e6c2438d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of urgency lures further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://teranor.com/ckfinder/userfiles/files/zalorikatugamaxuvufu.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/200b4bac0315f861604d361dbc9dfe5b/35146680323.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/dilixirelorazutagupuvid.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/gidixipefujefenim.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/70137189581.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/79929088393.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6194343112.pdfIn PDF document text
    • https://csodamalom.hu/files/files/66156806282.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bead9edf6a---18980919250.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/58449350053.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/pkr49l6qvjdqmksh7of0mair87/26625137921.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sizasefuzotumegobuzo.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/28434253076.pdfIn PDF document text
    • https://fratellifurloni.it/file/15258674830.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zovifavubaw.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3650a7087---33058629969.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/79997993338.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e35c71df8---nezurupowojulepivogiropi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2fd333719---82548821441.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/sazotikubesujamupobe.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/23380660804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+ketosis+in+intermittent+fastingPDF 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_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 10700 bytes
SHA-256: 9c01c811c4385dba5968cb32bad0cd58ec67810b583a8c83cd417d6855e5a594
font_01_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 16972 bytes
SHA-256: 42ef8448c7da8f2c7f44ad4e0e10149dd6ae7530732620d6a9c0fa4af58edf44
font_02_sfnt_off00014220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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