Malicious PDF — malware analysis report

Static analysis result for SHA-256 8970ae1d54b2c02e…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 20:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4ea157be368f15296f7b717dc99d19be SHA-1: 99b457da13fb2e5d08d30837cdc42e972d7f2197 SHA-256: 8970ae1d54b2c02e40e3916483e3ec4f83ac4e21bb62613a0e15a4492d58167e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=how+many+bottles+of+water+should+you+be+drinking+a+day PDF link annotation
    • http://coyada.com/up_images/up_images/29219128831.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/47052162107.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ec61c7b7---kaderuboriwaruliwarufuwo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2fb773fd966d6d19a83ce124992a16fd/xavuzid.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/putasokovojazuxuvew.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2a57e42f2bff0b6fd0c819797c070f94/74958727371.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/34421985041.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dd1beba9424aca0b5dcad4f763cc8d64/divurokiligavugozove.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7e6dg965fmgv83krbh6bsfejpn/xajenokugozukulilifaporoz.pdfIn PDF document text
    • http://edgecs.net/documents/jibofosawezozow.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c2ecea19---77609420742.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/aebea6fff77ae11cb75845deea3ef599/12711692801.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/18034335572.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/puvafo.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1816d5c500ad73a11fd46b9219b0a992/98290951035.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/sabenisesaterimetufepag.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/909d7a7be103dcbdfb7a0f60240d99e8/mimoliveloditu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d2707f3aa776c59918dfd529eea79b1d/1617679291.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a77e526c85cc971c3a2536b094cbf701/44905232075.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/werexoboxejulevuj.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/26509986286.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/61904907805.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e7ff469365cc8558d9c709f2c8bf9874/68299692470.pdfIn PDF document text
    • http://erdbau-rauch.at/39269594550.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb0d33cc68---giduzefazokarotupiduvi.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/55573438723.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_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 17860 bytes
SHA-256: 916692f3928a90e8e6a45d4e0e8dcafb39aed30971c0522b69ebf0710e6c8a60
font_02_sfnt_off0001359a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 11324 bytes
SHA-256: 1572d69f9deae79ad425d44ec92bba9701041c570136a586594f64c5db5b5acb

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