Malicious PDF — malware analysis report

Static analysis result for SHA-256 2281626f50c06260…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 00:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5831e89df530b354a8e344579e4ec520 SHA-1: 8623f292e0e26f4581dcd149a222dfcd2897bbf9 SHA-256: 2281626f50c06260f726ce3a962094702bcd278215f3be39fbb335e08b99be3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing. It contains a large number of external URIs and links to compromised CMS uploads, suggesting it is part of a link farm designed to direct users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=impact+of+globalisation+on+indian+society+pdf PDF link annotation
    • https://invest.pl/userfiles/file/60099409254.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rga12t9qsje6h7sv6dfiu1nkl1/80756810082.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e841bd03ce3788b87c7b03213ef9b96c/4714720273.pdfIn PDF document text
    • https://argumentua.com/i/file/27794148113.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108230852582358.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/69032592191.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/vabulelisezodanagutanona.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/l0d7ap815tu079ju4odhqp1q22/fupudokagoboma.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/nereloraxidazosod.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac8a5d7b6---vokodazuropefepazi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608245de2a460---bukigigojaxeduloko.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/48272903905.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1267464f9d386a287a074ed76f57776c/38237244902.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb2b45668---95273922837.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/teremobakejotot.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160829f109b95f---61364174509.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/foporaxes.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wazuninajefafav.pdfIn PDF document text
    • https://ienter.bg/files/taxisajogutit.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/39507282153.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdcf163c332---12562064633.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71c2e5020---latepimipozugunesumu.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/vuwajapidimivum.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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 11068 bytes
SHA-256: e0ba8fab1f824b99d2919f94a09b41679520cd36fdab36f0ea9d54634cb9c5bc
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 18088 bytes
SHA-256: a188885d7d1550d564cfb5a0221992c3501f7e30d216f975dfe9dd97e98c0738

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