Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1b94202327c15b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 21:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 01d9cd5ed45c9c2f85068ac901e022ee SHA-1: 93a636fe00d4be78ea311aa9553c9b761b333a18 SHA-256: cc1b94202327c15b7cc01f61df83aa1c7565d6aac57fb81e9fdbe60695aba335
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute or redirect to other malicious content. The presence of these links and the overall structure indicate a likely phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/eab66f6c9cf28d0eab3c2b99139f0c8a/19663589253.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071616c3091b---liwisabapigodapakidak.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/70305561019.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vflglf9g6bl8puo1dig5siiuh7/90203545638.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c93l40g4633gcentu5epq3101k/18082972919.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608806c201ce7---buwovebe.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/putazisazikokipikuba.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/96199877238.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nifagogivotifevupaput.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/97324085413.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0015076a3822745de40fc12440749885/kiworidan.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b2623e81a---pepipasep.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64c53398d---rakipomawivejejijunuxinik.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/61756180640.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/fiwarelajogided.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kjagldhfa9btci8kgobinf71m1/satizowut.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/bavamilinofivuxinazu.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62653691325.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc80f869abbb54bf6300bd2a0446ee20/94053386621.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0a471530a33100e2bfe3837d336e78a4/mezabozivovaraxaxujew.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/88812515057.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/giludipovugi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-13/20210513155754206908.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/83187069797.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d705039819---xifebuterixuju.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3ac54e31e5e6b9ec66e7719f6148ee46/pazarodifutazar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=plagiarism+is+the+sincerest+form+of+flatteryPDF 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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 17528 bytes
SHA-256: 92abd48498917607d20c39dedfcf8924592835eb48d7132d4885cefc7bcab489
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 10900 bytes
SHA-256: 32bf44d4a34c3ec6d04f76ef5c63ff50039b8367814ae81eb2b163f5a70a891e