Malicious PDF — malware analysis report

Static analysis result for SHA-256 08748e1c73355b39…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 17:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8eaeec5a153342c717a0429f9eb89382 SHA-1: 79a7bebe5b06d45823ba73aaa1d82dc90bc8cbe5 SHA-256: 08748e1c73355b39ec4548972dee94570e8ec61bb217073870ae586d5cc82fb4
176 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various compromised WordPress sites and disposable domains, likely to facilitate the download of malicious payloads. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, further supported by the presence of numerous URLs designed to appear as file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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) or Microsoft license-boilerplate 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://drafthe.ru/uplcv?utm_term=city+hall+inspection PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5404e7252---28681080022.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608343a516821---28856746649.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/lozizexazagapinab.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/77883252041.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8upv2g05q6us9efheah0pgsr5/sisijives.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4727f9728621095ae2d319cd680d5a37/pekoxuresirosuju.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/70583173717.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c583507c346---62075339950.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/hge022eo5a1m4diqfmno0nd7k4/fidogutafogorupimap.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/sidakupijefe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926a597105---rarexe.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/jibopuj.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zijamasenibenisar.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/99066006938.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/48234560040.pdfIn PDF document text
    • http://apcmagon.com/userfiles/23390262563.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/65813559011.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe51419059---87597585542.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077fb35a5---domimowena.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609695bea3d59---jofajenuluf.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/nufujopebugow.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/2852a407792c42f092f60f1b47572d9a/7908062843.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f53362a0a2eb1ed40ff27a900f95545d/pariwikefurukowusi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/623d129786d30690b0d6ee5422a7ea9b/51746435545.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fvuhlcsmnffe3ksvgdnnutrgip/migavowinetasotoxiwa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0460a8261e7a64b1a666d49e58c26f24/20691335992.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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 16756 bytes
SHA-256: df8b2d1f3f79f156d7ed4c74bf7d4a501c5a8cb1c9a494ed7b2791bd15558e2f
font_01_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 10516 bytes
SHA-256: 04afcd119fba7caee9ea5e5588cf74afe12ba29a09efffc132c6d4125867491b

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