Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f873be59d37d5dc…

MALICIOUS

PDF

103.5 KB Created: 2021-06-28 20:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6d230f3a7bbca0c0778d98365528c6c SHA-1: 2eca8e7b9aa7669c3cd9e68b4ebd05787499065a SHA-256: 4f873be59d37d5dc80a40cc2a10b3cf4852a9e215efc02ff91dc291a9ae4905d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=charlotte+county+board+of+education PDF link annotation
    • https://boucherienabli.com/uploads/FCK_files/file/81574743657.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6b469c7a99224608c1ca39735088d8ed/45651792668.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979194ae98---33397316077.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/12348740652.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077faec54c2a---79295704776.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a46766584---99393221626.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977d9b74d3d---61850560192.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/58315081585.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/3603190785.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/36948637363.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/10fa839d6a5a9c42ca5f4c93c594bf57/74282931465.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/79879978309.pdfIn PDF document text
    • http://vce34.ru/attachments/file/39417260140.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/c5hlcr0j4mn05npo9nfcmmq278/88603739993.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd935bb4d---99904321830.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e430ec2c---pakagifixunelelitilajorup.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ggdik5dg8vjuf7cp52ib0i0nv/mazeniresekojelanujewez.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f5a0a2b6b45d0be54ee53700dfc01c7c/72916084477.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a093821fa814c8c240a5eddc0b112c70/texuributifowelutifujek.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/puwek.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/45839839442.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/gk09e0u9qj6ulbi6on8d4o3tc1/54448924910.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/26308403180.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_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 16832 bytes
SHA-256: 1857cebecc4485db703129d216bf4cc2148198e60f81e401bab706f8a26c425c
font_01_sfnt_off00015fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C5 10792 bytes
SHA-256: eafa9e3ebfc30f83cc47fe21c803d4ffe3e121e969bd732cc1c3d4e8665dcbcc

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