Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7373406f621eed6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 17:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a18f0e2dbb62e841e1784b866215b723 SHA-1: f155638148749f3f3e51b1dabcf696e9988e80ab SHA-256: b7373406f621eed618a01dd2f48b9ea2fd98300df1cea2051a3263b5c3e4e30f
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of AcroForm button actions further supports the possibility of user interaction leading to malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374ae54e18e---41136991211.pdf In PDF document text
    • http://premiumcsp.com/uploads/files/xovafovokikimetanepogo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135e54883fae---nelifofim.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fateruvenewekuxadogusiw.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/tepuvituvivuxejubogawulav.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/duxum.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zokejojegavutariragudaxa.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/poxitotepinirevaben.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4766d45e4---tizonisivef.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/vodajakolisuvobinadiba.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/vinatotoperipukaxureba.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/78993907809.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/rowesedaporidas.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322d1c093f5---56779677209.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/kafalepirozilux.pdfIn PDF document text
    • https://halead.com/uploadfile/1630818048.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rapimazimujaluzifoponu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/04cbfa10eac9e51d910355930acfa276/72766444349.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9c2da978df9ae474dba6e8295fc34c59/60259219426.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090515075761.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5f11f9b6---5118104424.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/komepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mastermind+use+of+english+for+advanced+and+proficiency+classes+pdfPDF link annotation
    • 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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 17140 bytes
SHA-256: 5dac1ddab545ab1381f8b8bf5eb888a847c5f17573753f99eba4897d64aab1b8
font_02_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 11340 bytes
SHA-256: 565efd157de9e27b239213e17b7fc706124f94dc9e02d2cdf21082171577a0c1

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