Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cb45c2f333d695…

MALICIOUS

PDF

89.3 KB Created: 2021-08-16 17:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e25033f12bf7fc112f05e8d3c49a0bb7 SHA-1: 5439416a9080e190b940bf72103ccb2abd975c82 SHA-256: f9cb45c2f333d695893b9ee17bf6d2b05dc264d221421ca1011cb239c2c255c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary attack pattern appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=what+is+the+meaning+of+anointing+in+hebrew PDF link annotation
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46419806139.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/sazus.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/50707899813.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0734ab1e1e6b6d54aa528e7ba9cdf8ba/39850800195.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c104e35ff51---mibodixowarev.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd694a624---zutodekij.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/165hpkbn9cathbjkkt0pgmr50m/ninaw.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/1oad560nmf0a2tk1d0s25raegg/xijowirumulavopiriv.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/60420443637.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ef9f95901---kegunodizugo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cadf46f3d---xuxolujegadalilodub.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/59875539356.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5d247ec434f5b0b6acf64855a9b9827d/76880876512.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/revigo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6eac5a530099717cb68bf889758ef4fc/kupinevibadebosajupuwe.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749a095c8d1---97528764554.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v6idjgj8a5o9o6u0qaeja5nfm3/nolotigebegebirenofesedot.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ee00eb798---72949354742.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/60abd15196de0972d865201836779acd/xinodon.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/36284530978.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f85dd1218---bufisupajilewose.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/zisetikibilolafafebetelug.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/56526276505.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_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10832 bytes
SHA-256: 45f0629ce7cec1ca80ba12e9d8c6ab2e92751268e958b91413e7e1fa354ccef5
font_01_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 17020 bytes
SHA-256: 7d47f2689f7252ab9eda746be790cb1beb89e23cc2771c66ae45d6eefa344901

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