Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edc93003fccf4a4…

MALICIOUS

PDF

88.9 KB Created: 2021-08-02 15:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 19258547d3cb93ec91325d30e4492789 SHA-1: 6afca9a224c48ef501e4ec2f1bc91b209913fb9d SHA-256: 9edc93003fccf4a4d736cc2d163c59a9d8f4ba7c229696c39488441578d33996
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users into phishing scams or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=que+es+inmutable+del+signo+linguistico PDF link annotation
    • http://gramercygrand.ru/files/file/tipanawufinek.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ed50f39a7f3---walofuzovore.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4be4c202---9388498164.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/od4oo8s0o8dla87d1357562poo/nasorumeborofi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e13dc957221---lepenopazalaboru.pdfIn PDF document text
    • http://epmachine.ru/d/files/76882109326.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfdd5c20e408fa4fcd696bdf60582b60/bamamozomin.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210627223130_36keug.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/69706977211.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c74823f3863---savudafoti.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/lilokasekigujigikojo.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/fobeje.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071342a6e568---99342240226.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072676ea7c99---govuzapowewelovadu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077340831395---jilatirokilofukilixabas.pdfIn PDF document text
    • https://hirurgija.me//files/70521550302.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855a8edc17f---60880277568.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160846190e7bd8---rezewo.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/dotabakexozipodoroke.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/62947621540.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bb0c5ig3kq7aqq1fi5mrtet29c/71646147460.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0357b3e53f8c5aab94e3a0b479366ce3/dudalevigefusutuse.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/lenivub.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b787cf541d2---tometajosukegivodak.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a9a83f5a---52823129082.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013402.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13402 18884 bytes
SHA-256: a98bf76e4b4a793676ec7ab3a73d9bc70dde779687ab3a3b4a05c992fca6277f
font_00_sfnt_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 18308 bytes
SHA-256: 735710f0309e489196615cf7cc686d7ae36de6cd264c903d9c8e622f1994ccae
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 10912 bytes
SHA-256: 4dba0b7cfbba24b47a9e9a36db50618b8eb85122502dc8eb84efce4ae0b20871

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