Malicious PDF — malware analysis report

Static analysis result for SHA-256 a595ded9f6eaf523…

MALICIOUS

PDF

90.4 KB Created: 2021-08-12 12:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d87ef95e83ed0951d5351d0b4841869 SHA-1: a5ca2bf21d79a1664ad053ece39ace485bc59366 SHA-256: a595ded9f6eaf523e4e9c8900e121c1b92c45a6e3bdbefa6d014487dcdaa4377
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and other domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=ilyas+ansari+community+medicine+pdf+free+download PDF link annotation
    • http://spharma.ua/files/file/jojeneralipuda.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef090e898b---waverinexasomutavatezarev.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2098665f---jodipabawarezimaxuwoz.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210630093216115.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/07dec2c6aabcac523838aaa75903ca6a/somirulutof.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a158795365a2bbfdd9ce0678dcd60d4e/zinuxumelafukerijukaj.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616104b3f2---1032675350.pdfIn PDF document text
    • https://areicon.com/images/file/wirapikekewosak.pdfIn PDF document text
    • https://chp-travel.ir/data/file/28355905739.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114d306c83dd---31208635603.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/295732hkdqv7kek2lvvrfu4bge/juwimidopatonegi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875a7306e4---41972327427.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/hqleusj15a6rgi7524ipm29or1/kesusasituwukajuvarusefun.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/973ee38c6c150ccda3bf1287743d2603/86440734760.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/sakakukidujepuseraxutotom.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ede7ee9a---tenowomuj.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0575370c8cd838aee43c4bcd92d06a9d/rakirujunogakamulo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f175bced3f5---74863695506.pdfIn PDF document text
    • https://atl-50.com/files/file/suwukakigagamegenerovise.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/vulorawisolevojusidobunun.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5684541bd---xosivewufozumaxasunuw.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/fitarisumudesezaferat.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/54634111489.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/fudeziruxozufidod.pdfIn PDF document text
    • http://calisnt.com/uploads/files/56251196507.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_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 17304 bytes
SHA-256: c19fb0adef22e70d47710364a4b2199c2fcbcaed8281c1975f564c6e08bb7d9c
font_01_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 11032 bytes
SHA-256: d6d0c3a8a13f0118005a8c4d0ad183bbbda8420f720cf8b7a487b98e37be85b5
font_02_sfnt_off000143b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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