Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cc275a80a4348d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 06:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29aa3239459771ff429f21a3dc8fa046 SHA-1: f312c015abab4b2e33b575882e8ba603cd8acc9a SHA-256: 42cc275a80a4348dbbc589cb53097706cc1fb659f534aadc765592c6233d4e31
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external resources, some hosted on compromised CMS uploads. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further payloads. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://100tmt.com/uploadimage/files/20210901095549.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4453f80c71e3640a562d60c774904f2d/wimexovir.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/wijedofiguz.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109030537378021.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fab15b2767ccdd8234fc932a25ac6101/jideweres.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/fatodos.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/mexetaxik.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d936806581f7cea4ac6ace35ae67c4a1/ludozokapotobab.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/51518632526.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/43527558995.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/94492097068.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jccgj3b7vq75llmv84fc3kus9n/gidebetefelomurezu.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/fiwoletinapivejigaf.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/dodawupomunisomidoxowelan.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/domisasepanevasomidege.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/37705587565.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/lamekej.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fezuxinunexujiruse.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/rowogunadotidesuginuvugaj.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/menomagalu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/pinexefapumedaxud.pdfIn PDF document text
    • http://17njl.com/userfiles/files/juporumolovilil.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/61597893734.pdfIn PDF document text
    • http://word.mn/uploads/assets/44019329947.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c162666e7f---15184376654.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109081054046522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=call+of+duty+4+repackPDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 18868 bytes
SHA-256: a63f9528184d9b0934e03d9e73c2ffd6ac023f4c9aa3cba60049d41d94c0aa32
font_01_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 10664 bytes
SHA-256: 67220d6acdd4262a6c739eb4011cc70788bd515105bee516425341e0c191ac1b