Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88b1963b49b5e61…

MALICIOUS

PDF

74.2 KB Created: 2021-09-02 08:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1b1417647e5fa4f6fbf6a65d3ab1bcd SHA-1: 21129803fc8bcc31b389d2d450282645acaa7a8f SHA-256: a88b1963b49b5e61d417c39608a7a7fe4b4f6a3110085470a5172d72fb59c4e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of these links and the overall detection by security tools strongly suggest a malicious intent to deceive or compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=eso+how+to+make+gold PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc01684465---bomitirarapuve.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c41dc0f18e1---menukibupupimamenik.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/5839454909.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/65476064888.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/75258377008.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e79cb91e84b402990026b448c95db2dc/modigezabobufafiv.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fbc2d2b221de19591e7c65ba3700f0f8/benimukazetowuwepupo.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0c19d9d183d1494220221755201d907e/82041111457.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/145261040660e2f25b0c1fc.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/94375873685.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/81c9569306c9ee56c07f59d3dc06c3af/xutisagufev.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5ab837bb---magexeguwekubusosimabaf.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/37727734017.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080924b62779---rufirofomapovesul.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2u9td4hu48ikt0qvqkaqfkopc2/zujezuvawutiva.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/k4u5l6u58sf1nfpv8d1s8vlavi/4233889656.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/kodijunarelafonataf.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/teginujozesazisagaju.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bf369cfe60a966637c0ae0b1873d00a8/37892797266.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/61671011706.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893daed8fa1---kadaperevu.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/napisarinuselipi.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/lovanekezetusos.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/67327882372.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_off0000bfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 16596 bytes
SHA-256: 4d2021c6058e8219eaf645a5f75276efa9f065c6521b9612b34e89b1654dd0c4
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 10560 bytes
SHA-256: 85ddb2fa7b75930121502c20e897ce1cb5c69ea33287161865c133ff5554345a
font_02_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.