Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bee14bc2dc37f2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 02:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 274cf4c24dc4c642af98e63c78862321 SHA-1: 7b7502faa045e65dd35a7dbc327261f9b58b0d56 SHA-256: 88bee14bc2dc37f2c60f34e2008fe267a8cf1ddd47fcba9147157c5384fb904e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to various PDF files hosted on compromised websites, likely as part of a phishing or malware distribution scheme. The presence of invoice-related language further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e523508bc2---5847278144.pdf In PDF document text
    • http://kawoka.com/userfiles/file/84662893364.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/37562b5bdc25403a8c9611b9ee584b8d/vebava.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced5c51aee---desaterebevibanisesi.pdfIn PDF document text
    • http://www.celso.org/download/23630370334.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/95916378060.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/bh7uncj8gvs3fsdn6hv4sj14d5/gajojejelijusufenep.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/fenabixifamaruruluwat.pdfIn PDF document text
    • http://prosquash.by/data/buwenegolaw.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/70629359349.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/nokasupisezufopidigejage.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/089p4cf84tslm5h9jgtdiqb693/47749932089.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/54934213776.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/62915795114.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/buwegimabodekasumadipi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/skdofji5fthddjgvoen35rihp6/84656597250.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/82f6735bcfd96428d530daef7e9b6592/zukotawogixe.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a145b6d675bfc039c0e148456c3f5d9e/panosowur.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/53739525770.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/87530941884.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b91f84b5e54934fd2611703b7a134ad8/2877568372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=petty+cash+voucher+form+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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10924 bytes
SHA-256: 8fcfbd00975c1efbf61d7687dbe9969b3619a5ee43da30f09def4e05cc7b2f44
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 17344 bytes
SHA-256: 7a50d941df49f27e220f6b14ab36df5b5e1606c0119503a82da8e0a82d163357
font_02_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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