Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ab9da3cb800de9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 13:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6b30dd7a4ad7f05c50cf1a63c94b9b1 SHA-1: d4683a9def08adb8d7aed66b84fa03460b7f746e SHA-256: d8ab9da3cb800de936ba4133a0ec4f4260b35c4b43061c1d7c83df23a478b893
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. The embedded URLs point to various compromised or disposable hosting sites, likely serving as download locations for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=lecture+notes+on+electricity+and+magnetism+pdf PDF link annotation
    • https://stcc-sa.com/motakamel/Ups/files/jetakasekukezafonekejux.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d80e961e---12866101601.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/telijunu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503155239960186.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/5048414201.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3631f121a---vizoboxesafulutin.pdfIn PDF document text
    • https://masihpt1.com/contents//files/luxupenofe.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d04m06k19qjbih84fjd337cfd0/24664498033.pdfIn PDF document text
    • http://atomleasing.ru/media/File/25956353767.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a964382e2---repizewadixikarumujusi.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/rowalufovetugox.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3ugap8brne98f5c7734k3pcrqg/pijogupimiwawifuru.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cfa7e813e---kofiganodoxufifewilofiz.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/5f103d4a89feddcba1e4099d6a2c2e60/92498709053.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/31/78950177625.pdfIn PDF document text
    • http://planetamama.ru/files/file/86120330874.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/pedexilupukore.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nf7drjitdgace8ksk689u61ls5/juvuganowisokafelopu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/34dddf835813ec6055accfd379560dc0/lagolipet.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6152e7616---71719384454.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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 11136 bytes
SHA-256: 7180dcab670e393a361a261041bc75400b21e1784ba4435963f1ed7ad28d4190
font_02_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 18300 bytes
SHA-256: 94f80f11a3fcad2664f8d7832265ab369db5c6a673f235df8746235061f3e99f

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