Malicious PDF — malware analysis report

Static analysis result for SHA-256 a247e651c43be9c5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 14:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82979dcbcb84a93697a735a32a9b31a7 SHA-1: 9de55364a66513d9987d3ba37ea976a6b7860e56 SHA-256: a247e651c43be9c57b62504e9893e8f414f1f576d7094efe01fff5b5b9ef4adc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL targets strongly indicate a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=quadretto+nascita+pdf PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe9ceba63a---30934979983.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/89ee2a8d3e921743a2301b68b9ed86d1/sigis.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4i4k77einelob2ckqseat0mj6l/xomiwov.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8460aeaa5---jotiwejitesaxini.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/eea313a8eb801f1714ad34c1c08b14bf/mokaratagenojoziwureguvi.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/mitut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf66e6c8c---12630785916.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160830ee27faef---vudex.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fulurejeganawitut.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/49367148383.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/kugafaramubaxor.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160df44bbac340---xejukodeter.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20217355575441.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a99ea562ac1c1829dd6ecf0a820d1d2f/42810883616.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/14983602600.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/rinekekawevapigufikox.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bepilawedusovipag.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/npmd595ihl8dodibd70trn98a4/karuvatatiroxakafajuweb.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/66424498770.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/45404390467.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/79926163293.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/75263419627.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/97915451063.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_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 10728 bytes
SHA-256: 6a8cf9e7a767491ebf858784e73cc56b743f9bb83b959c9626dd970b23f61b4d
font_02_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 17496 bytes
SHA-256: 3e61e7e57ef52c450a648a269136c2494c9e846db5f598c3925e831d17be0f42

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