Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f57aee4163f2199…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 12:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f69c5006679e081a0e623dd3614b94c SHA-1: 58bc1587604e93a97d6de3baf9e8a812d0b52764 SHA-256: 2f57aee4163f2199894fa2e7a928999588cadcf0134198ac68b88a1d76e68a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are part of a link farm on disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=sonke+app+apk+download
    • https://makanbanyak.net/contents/files/59070239282.pdf
    • http://sportingfoundation.com/uploads/file/69905204751.pdf
    • http://podhoru.cz/userfiles/file/10908919097.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/68651db7f5fc5ba0e7157e2c5c1c7bd4/43894768468.pdf
    • http://unicaconsultoriarh.com/images/files/80202032520.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/87268787643.pdf
    • https://rajatotogroup3.com/contents/files/basujefupubogavumi.pdf
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/14405663029.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329eec936d9---sawinakedamag.pdf
    • http://cerrutistudio.eu/userfiles/files/lazupapinimawikadur.pdf
    • http://vendsol.com/userfiles/file/xemuw.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/38258374245.pdf
    • http://bronia.org/userfiles/file/50134790085.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc182c657b---favomomasesudufu.pdf
    • https://samajsutra.com/userfiles/files/denibisip.pdf
    • http://jezirka-biobazeny.cz/UserFiles/File/69577331554.pdf
    • http://101balkon.ru/upload/files/dimefudetobobimumeruz.pdf
    • http://tuyothuyluc.vn/webroot/img/files/45872454607.pdf
    • https://073741256.com/uploads/files/202109021723278175.pdf
    • http://m-s-g.ru/userfiles/files/73374477713.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613395f33176b---favelurasolemelekotad.pdf
    • https://bengalroys.com/ckfinder/userfiles/files/56605859980.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/jivowukilemasukofew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
font_01_sfnt_off0000fd72.bin
fdfb59486367d0cf390e1fc5b94cb2250b1c456f2ba7cbfdad9e6e800641d15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10180 bytes
font_02_sfnt_off0001146e.bin
65da0f88d730e0926810ec6dddcdbf60fee95ee4f7e433ed7641c45a21acf967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 19028 bytes

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