Malicious PDF — malware analysis report

Static analysis result for SHA-256 170f83d9564b3d44…

MALICIOUS

PDF

88.8 KB Created: 2021-07-22 19:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 24ce9b6e5e423dc0066f1e45c55e52b4 SHA-1: 87709e5e3bf42d85a4530442e77f398d7bfbb0b7 SHA-256: 170f83d9564b3d440767fdade9ee2380b1d1a70bf13f90e5159690c5e91e43ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://healthmatters.me/userfiles/file/lifalaxuwirebewor.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7907c8fdf22d2386bbe8d453c8f8e988/xikepikemokopiwinoretep.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/17647229121.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/85cdfd125f03152808b55f0ce313aff2/pozabinosefujamafu.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/75336285502.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/421a381e1189e55bbf836b68129677f2/47180624986.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab051163e48---61665909660.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/99170031626.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/af7032068f852102043191c42bd7d775/vibod.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b42cd4927231a3b2295c935a77d4c021/talovepakatixaroboz.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210702_FA33650F5492A257.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/tetel.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/duvufiwulaxugep.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608af200b1c77---zezejumolavejisexubeje.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076024a110a8---37814363415.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084449966a2b---2828032151.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c704e252f1---4737910368.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/umlp2mkadpjani0ltelcan7dj6/31000064220.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7369abba5aa011341195f7f7eec1d5fa/temevefumusilajebixefupi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4173739fde229750cd10fd0477320e8c/dazopofebo.pdfIn PDF document text
    • http://short-story.ru/upload/file/ronumexavosub.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/ruteziwajuranubo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d3bebd31b73f0c8cfa9fe5b115763267/74497799872.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ebb60f3fb---wutufogadezibidinuzakod.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/wukosupuxobobaromevipufa.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/savedovobebafosidubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+many+hours+a+week+does+a+teacher+workPDF 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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10880 bytes
SHA-256: a72ed32200353f3028db4bb6c99174edae7f45ff8961f7e71689596a9b4994b2
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 17044 bytes
SHA-256: aa76bcb06bbb732dfd26ea94474b4afc0f50bfadfaeefb3c74f44781de50bcea