Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f83918b23c74eb6…

MALICIOUS

PDF

90.5 KB Created: 2021-08-08 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d2504c68f899119a638ad1502993d0b SHA-1: 3b958e04f0204ef803a448d469127bcf260d9d6a SHA-256: 6f83918b23c74eb6d621acb1836dd9b1bdca1a35af670d9a5b544946ae76fa1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or appear to be disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ubranni.com/uploader/files/43391689080.pdf In PDF document text
    • http://qdsenfeng.com/data/files/20364410959.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32b78e1c7---8038114840.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/punopopuga.pdfIn PDF document text
    • https://strechybenesov.cz/content/90301533499.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12404679650.pdfIn PDF document text
    • http://marymo.ru/uploads/files/50703139606.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64d3302d48---bigebumufazoturexawifo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/60369984188.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/mulufad.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/31862599232.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/772444a9f8c5da3865f763320ac0710e/movukunozewejoguga.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/14710794378.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/fibuwow.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/533894ec525fafdd0c532da58aa6fde5/59451140205.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/64252291136.pdfIn PDF document text
    • http://aweibel.com/Photo/file/bixupajigefojujibeju.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/wagatavutuva.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/78388274323.pdfIn PDF document text
    • https://luminex.pl/upload/file/jogidovofamogavuretiz.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ja2poou69nc7k02jmimtt6602v/37910290058.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/45856440958.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/64053427450.pdfIn PDF document text
    • http://btfa.tw/upload/files/runiborevidurotodabo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d8dc694e---71842883494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+are+the+main+themes+of+persepolisPDF 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_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10616 bytes
SHA-256: ec63104ac3fb4461b9be41533c71efdca030e299c38286e9094655d56a8e8e2f
font_01_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 16844 bytes
SHA-256: 9501d5501d483a81e3924306b86d7c9d0ababa7f5e192a15c5c1095afa30dd39

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