Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9822ac88ccfaa72…

MALICIOUS

PDF

78.3 KB Created: 2021-08-03 01:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad2bc4a1e6650f6b60d360880dc5bb5d SHA-1: bd21e08919812717bae330817319dccdb27369e6 SHA-256: f9822ac88ccfaa723de035f2214848bac17dfb363f8b56762b345dd56ffe80a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely for phishing or SEO manipulation. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=unblocked+games+stickman+escape+the+prison', are designed to lure unsuspecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=unblocked+games+stickman+escape+the+prison PDF link annotation
    • http://abnicum.ru/files/file/fupibipunevemisis.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/53936777676.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/5111767233.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5d261d41---38105838913.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ddea4221b1f9fe5e29fe64260f1f0d4b/pajevuwu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beafbaf1412---1592326218.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/21629383733.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e058a0f72---vevemomuvoluxabotujeteb.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210730034459551.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087a177dc96f---fiwevisefofuxulurifepa.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c4ab2a006a7bd3e9f22c3b31681dda07/38457556179.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/24537812776.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847b599f52---gipobefosabojameredini.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/62759243731.pdfIn PDF document text
    • http://schokobrunnen.com/idata/toviv.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad997ec582c---nizinifuduxavemineto.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/sujozigijuwogafizune.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6643887d26b62dadf79a8ed2b5802c3a/60355592577.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/10319355171.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/rufugapowuxiviwevij.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/kixubapukoturera.pdfIn PDF document text
    • http://roocenter.ru/upload/file/67930793343.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/56117844082.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/ledowigebetivorejelog.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_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 11200 bytes
SHA-256: 8a4d805fb8cf6a11c2237ae5daa2cadcef64d7d212b1c63606085e0200b185f5
font_01_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 16332 bytes
SHA-256: e6c7379669e82e900e30b2f2173240e2a4c38264f78f373a1cd54a6db429f875

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