Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff57fc172c245e2b…

MALICIOUS

PDF

101.6 KB Created: 2021-09-02 16:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 013f92f06f11199036a57a20820faca0 SHA-1: c906588d5e78e36f9dd15ce16ad7fef5dcd556c8 SHA-256: ff57fc172c245e2b2241920c24aa504f90b6c7a5fd3a7dc2002c32e9b5863e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=importance+of+environmental+analysis+in+strategic+management+pdf PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea1d382813---71447186944.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/92519fc9894fd2a2f057437a9c799afb/40319385807.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/21179491806.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d62a49b6e---98073549249.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tatol.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/59270274327.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a6bee46892a5f3135056177cef817bea/kodeboxozoxaferu.pdfIn PDF document text
    • https://blv.by/upload/editor/files/letaruziriridexexirev.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/kixumibisefawewagakori.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/35491329855.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9d33d57677b87671c324bd98f2f22f57/wuwebogumozin.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/benugefebovivogekudule.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/86062585156.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3c6raq5amlvno6kinl96abdhjo/36057339186.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/12356042657.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a92c648dfbd1704bcbeabeba4ae15632/jilunovupesaxulusuxola.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c27425c86781c41b95e051fbd1bf6b3c/mafanag.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/midomuveluribadapi.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_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 19136 bytes
SHA-256: 713bf965acdb40415246ff9b50960b9ea65ce87422039a5f43bf8c31986820f8
font_02_sfnt_off00016e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E98 11096 bytes
SHA-256: 1f39c845ef4678cbe4386448b3ea4333a7d60fef8975eee6cd418bdc32b6df78