Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e7f9ff1e509478…

MALICIOUS

PDF

95.5 KB Created: 2021-07-31 17:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5f7ee7aed71f0ef13f29af9278d74a0 SHA-1: 205c597084e80c70b6b5934bb1dd905704373bba SHA-256: 86e7f9ff1e5094784eabd9b51ee82d9d785a2097604951f2e017423b04aeebc0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or scam attempt. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, likely serving as a lure to trick users into downloading further malicious content or revealing sensitive information. The presence of PDF-specific heuristics related to URI links and link farms strongly suggests a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://infrive.ru/uplcv?utm_term=individual+income+statement+format+excel PDF link annotation
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/57571653590.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45352049005.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jssh1ufe2q6eqhcbbo64migil1/48673183749.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12c487be6---89239872114.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/timax.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989849905a---97756525587.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/umnap24eh8ngcerda127ps0f00/varoperokegorerojo.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/lizimeget.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/vazajiduwenojifapod.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608859fd10702---210290328.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/72029309150.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/96975699036.pdfIn PDF document text
    • http://salkim.com/userfiles/file/midodaliko.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/sululute.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/36068166353.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3217fe21---25644854315.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/775a5a0561d8f2daee39c48545f80548/dazasirewo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ccdd403a3af8e928fd949a2de8b799c/93975992345.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/36176305131.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/acbd90f9df817892ba13eec0fbeb0c6a/mefajenaxulodofosax.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1df84264d---53583299366.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/duwipokigedolafe.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/pogozepugivunowikivizuke.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a00c51b4ae2---danok.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/23701762662.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_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 17144 bytes
SHA-256: f3155b3bbed76131fa860972274e9062929e8b4a2a0ebf4916c941f7afef3ff3
font_01_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E9 10856 bytes
SHA-256: 7310bd1589b4e9e4650ca8251e961b73b1476d22e4acea84ccf55779bef8b382

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