Malicious PDF — malware analysis report

Static analysis result for SHA-256 980989405774a1d8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 17:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5eddd1cce08bf3f0c24958de51166ad0 SHA-1: 7e4ccf71bfee1f3810aa1ad5152fd899e577b74b SHA-256: 980989405774a1d8c0d05f2ec9177751b1930993ba9fd6969cd8de802b51c2e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress upload directories. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user, likely as part of a phishing or malware distribution campaign. The numerous external links, many hosted on disposable or compromised domains, further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dnsbp.com/all4help/fckuserfiles/file/36202303742.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9caa7246372d142211419f0645b7bc92/toropixodixijinu.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/71639273657.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/anen9hdvj4k0qi76ftaapjt9i5/51010311429.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda788cb8d6---90064420978.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4t2ajd8rsevjrdp2biq3scjnn0/rosisazuvavuno.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e15bcbcd375---97977338432.pdfIn PDF document text
    • https://stopserv.ru/files/file/ziniwitomituxi.pdfIn PDF document text
    • http://faradbox.pl/files/file/46909410899.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a33d31f2f---tasuzewotinuxerukowidenu.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/lakefererakupekonolileror.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83a9064d7b---90730558688.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/jotinewedezewesuwunuze.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/88fc0d3cb3ebf53f9e6a035dec94d34d/mulajijuwovojonanil.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/petozawigoso.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/47300938091.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fgjmmvpef8tjkjvd04qqke7s31/bubarebederoxosejiv.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/rusexumorejowazefinari.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/40719589643.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02c5c8603a---bunolujatene.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/42655030875.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xononaxigosulujob.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8e9d3ac88e99b85454f48b5b7e591d3c/zegiloxoxud.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/ronefovotutisato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=perfect+tense+worksheet+grade+5PDF link annotation
    • 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_off0000bf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF66 10932 bytes
SHA-256: fbb14a72218193418c4a5508dc48c1034346f10b9ebdf383667d28791fb8efbe
font_01_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 15708 bytes
SHA-256: 9456b5f669560ba55de6fb98b6a1181e49a43f39f587849a5ae8a7fad0250ed4

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