Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bff3043de64b593…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 06:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9ce6c34d5b2bc37c538f23bc25185fa SHA-1: 072d9d28e023862d39bbb085c6af6ea3ae1446e7 SHA-256: 1bff3043de64b593ef4533ce4a8d0921daf2fff53a73957b8102ee6432d16bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=unblocked+two+player+games', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=unblocked+two+player+games PDF link annotation
    • https://songiadahoaian.com/upload/ck/files/gululilimaziriwedaf.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631387896.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/89910052720.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134653304a5c---relilititisofosuwupuboso.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/vapowumebozatisizevuxu.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/18329485192.pdfIn PDF document text
    • http://www.pilartangguh.com/file/66698969810.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/93568159688.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/tikonosozowoli.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/60272587207.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/gejekada.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/kegusanerogatomefunuleme.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/medaj.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/45998762843.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/binipomofanuresizuganakak.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/dexejukoxadagigomiv.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb94a76178---71105921527.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/buzakajafame.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/18150444452.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/73499538429.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/41968243312.pdfIn PDF document text
    • https://renetravel.ro/images/files/37769187909.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614153342e4e2---76287658583.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/91599597650.pdfIn PDF document text
    • http://philboyd.com/97784231209.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_off0000b586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB586 11204 bytes
SHA-256: 617983bded6fca463f8d97cc10cd313677f6890a51d60c8d59f45a2d0d60bb21
font_01_sfnt_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 15208 bytes
SHA-256: f933c1b45a2982a34afb4e246cb4f488457f0516c0f93f13c59eac9c6bd36967
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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