Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79b9ad5a1353552…

MALICIOUS

PDF

89.5 KB Created: 2021-07-15 12:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44cdb5bc1e41a19ede61f95620a024df SHA-1: 8a983ebce9d7f3cde02630fe8727664e6ddde5d3 SHA-256: c79b9ad5a13535526d5ebdf460fe1450cf139fefcba93cf8b1d56a45b1d4e099
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bd49177c---51774954582.pdf In PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/wenibaxomareresiru.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607264101cf72---lululene.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/2762651950.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b674265a8---memebafunut.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/89440757482.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d4febf2402aaeb2f83a015c6984b9a62/bopamaributu.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/43341727617.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/tuteneve.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210603221132.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zizivexuxepivetodelokizo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad023e76987---xefeviw.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986c481953---3148667810.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/87277524737.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/muvapulexixeratewoforupaf.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pidisel.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/39rd2rsohvbug095g07qlvdcgd/wirumurujejaseriwaxate.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/ralavobewifakinoje.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tsutg6bkmcuvp2htdq9lf43qu5/66894243801.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1ss46olojeeeginva6r3kfre76/sejupogikubimuriresenoten.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/36024877835.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/58301440502.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/batudupeveropetupol.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/36489878657.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607293357436b---vezejirusaruferizovikita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+pedigree+below+traces+the+inheritance+of+alkaptonuriaPDF link annotation
    • https://medlineplus.gov/genetics/condition/alkaptonuria/In 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_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 18260 bytes
SHA-256: 036c6d663cac88e392a0e94f262bae6a2b7f6b6fb08f5512d35049b542dd049a
font_02_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 11280 bytes
SHA-256: ccf352afe90a4168b8d5a70b5ecd68f90ada8c9a5eed5c4527fb8084f422127d

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