Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f79148c9a2cb1c5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 10:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e71f3240edf46a4c4cc9f06b15aa6625 SHA-1: 4441d181a878dbe89c0e7e51c7ec9feecfb51472 SHA-256: 7f79148c9a2cb1c5b5988b41987360e648bb8e442f3d78799ba859139d2ea6a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to compromised or malicious websites. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=watch+how+to+train+your+dragon+3+full+movie+free PDF link annotation
    • https://nilsahost.com/calisma2/files/uploads/94790500740.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/parul.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/jusokaxuxe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410e1cd6b51---25389477245.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/11ebd752b526c9d4288a9b0b720c883d/4328781918.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/tufelifevonazenezojaba.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/zuforariwo.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vuxavafuloruvapoxafumudun.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/35458365373.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/taban.pdfIn PDF document text
    • http://signauction.net/userfiles/file/63470583420.pdfIn PDF document text
    • http://skupka23.ru/upload/m/moporenimibalopepubu.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/63080842889.pdfIn PDF document text
    • http://geose.ru/userfiles/file/satujadidegudikitipetapa.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/gegeferorotugarabe.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/ruferenexosom.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gmfe865knuuk4q1l53ij10n3ud/piwisafetuponubavimuj.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57397290508.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/paxisiz.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902185552368829.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/bofugagawuvo.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/bexipuzoxupuwedaru.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/turogiselarukoxi.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_off0000c230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC230 17292 bytes
SHA-256: 10e9584f4597ae2dc1260c0b4c5df3ff6de241d001175e940e169b53e81b5924
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 11288 bytes
SHA-256: e286441105580c78a8975bcb78531f255c92621269534e9229750b6655c5d3ab
font_02_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1