Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e0a78a9da203b5…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 17:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7da533486b4ddd84d04b0cafd7a9a0c SHA-1: 782251f94a874b0d82604b37a8e9559117215f13 SHA-256: 98e0a78a9da203b5ec890a306365917927f7d43b2e4ff16a87be11a7160eca36
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external links and the 'SE_CALLBACK_LURE' heuristic suggest the document is designed to trick the user into visiting a malicious site or calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=how+to+make+a+pirate+hat+out+of+construction+paper
    • https://bywuf.org/upload/editor/files/29277733297.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3f2e04d1ed2814e2e8b9d4eca2c49c74/2844429855.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7435e36545c707893df930e88ae15a2f/xaxitipiniragedov.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed1685918d---wutogoz.pdf
    • http://dawahcity.com/userfiles/file/26557446528.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f032db0946---zefijewepelamoz.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a643c9b1f86---gimorebuvufawitex.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/485j1k2ilrrfd42fkvff0767s4/sarukakulunabosegu.pdf
    • https://hondamienbac.vn/userfiles/file/71442791340.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7417b9022---vigolowijenuwodagatalaxif.pdf
    • https://ekransamara.ru/files/75252550214.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fdc5e1d4b---wepokuxosedimere.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c24ddc1153e---gafijedovisomegurovurezol.pdf
    • http://alvitraders.com/files/todoxogopizifo.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/92705ee6ae96611e0eab7dc52a8db9b1/vikaj.pdf
    • https://ceccargiurgiu.ro/userfiles/file/32283897279.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878661da6f9---sofuzotiwusemoriwiwa.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ede28250---63207094340.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/84a41a0c5164fd6f2d979e6b2a132132/3196252467.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a92095700---rilagol.pdf
    • https://damiel.eu/userfiles/file/89705159323.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/h0vgrkd84i8k602pvurt1sfke4/wadawakizero.pdf
    • http://nensi.si/upload/file/42184971127.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f951ccb4f2---83271957189.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16792 bytes
font_01_sfnt_off000106d6.bin
5832e4fb76c5b2e2b4bf88ac7d5aba71dd60dd6bd525ad9281b5ff1660e926b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 17836 bytes
font_02_sfnt_off0001359a.bin
8e956ca01728b0fe1591a072007cf686cd1c65e1d5de43cd033326e59e8e0969
pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 10968 bytes