Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2967f86e805082…

MALICIOUS

PDF

90.8 KB Created: 2021-09-01 12:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b177903a5b7cf20602548ca8d52aa17 SHA-1: 3a465cdbc4c43aee3fc1a33593157896478c1c0f SHA-256: 5b2967f86e805082beb4431116afdb3056927209f7e84d877a76d1277af34ae6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=wrong+turn+8+full+movie+watch+online PDF link annotation
    • http://mobydick-band.de/fckdata/file/tefagidoteleratuxupot.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/25779714505.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d23202332---34515303324.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125540e4919a---puwak.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/87286498883.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/ninavevusogekosap.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tasuragubamoxetugubitojun.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b167c3c7d7c---xawereripirugevobige.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/mebavavidowagosubekifobog.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/pidofudatagovez.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/09b17a5f8bf05d8f2c77aaf13c7ad6ae/pajolagedev.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa75d5d9ea---jatibivipaxobinuw.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/rabubepofajuzis.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e38480ba---84558532924.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/kefupidadujofibowej.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca96b0365b---misasuvelimefumuxejatapiv.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e0df7da025ca636bf4e1be0853cc5813/2452320641.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69f40559f---63243648738.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/44673663311.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/vizuritizisi.pdfIn PDF document text
    • http://cpviettin.com/upload/files/83226093021.pdfIn PDF document text
    • http://groupkaishan.com/d/files/tiwomap.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/c4so1ll3o8ckorfj0a6iqnp7f2/93712767251.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/37906581560.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dddf58b47---dozagi.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_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 17892 bytes
SHA-256: 368e58ae5009a249dae7de1d738a53849260623508a5b94b0532c241ccd0a0f3
font_02_sfnt_off0001430e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430E 11068 bytes
SHA-256: 46a20d3ad3568acc7182e77cc348a0f9629f829edc50df9ec88ae9ce3ecc0584