Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f62a7b835c47da7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 23:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db3fa156fec324931f86a5a233d5851f SHA-1: 2d8c1f84deedf647e40ea61ab90685c247a724f8 SHA-256: 1f62a7b835c47da791d90bba895021bedebc07f96475e158f07ee39c9942ee0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as a phishing trojan by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content.

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/146ba98d7b3a28ca079b7ea33aa6a484/61675965317.pdf
    • http://romengo.com/ckfinder/userfiles/files/zafebez.pdf
    • https://matfreklam.com/calisma2/files/uploads/jagulimeluvevivaxubexuje.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911231735.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/64041993330.pdf
    • http://xn--h1aeekk.xn--p1ai/files/file/4656130502.pdf
    • https://kindeeyudee.com/ck_files/files/53503940458.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5a901d61312fa0baaca891486d200283/budinudamesebisa.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/47344016086.pdf
    • http://back2wood.de/userfiles/file/kogilovujafeniw.pdf
    • http://idcla.net/upload/files/73771311817.pdf
    • http://alrabbancapital.com/file/files/linofinesoponulogaladubuk.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9b42a51a9ed9c27b82d6d50fafdab494/jowolizodetibo.pdf
    • http://chinahongji.com/d/files/2644597607.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/49465764129.pdf
    • http://becskeicsodajo.hu/admin/fck_upload/file/76110308310.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/20161094481.pdf
    • https://jingchengs.com/jingchengs/ckfinder/files/20210906050537.pdf
    • http://finpacecuador.com/userfiles/file/55568614265.pdf
    • http://builderall.info/userfiles/file/73905638228.pdf
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/gejob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=grave+encounter+torrent
    • 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_off0000d7de.bin
6acc08cc0ebf769be7bfae56ac638d9a13a05e0cbdbac8c582d06340cd252c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 17772 bytes
font_01_sfnt_off00010684.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 16792 bytes
font_02_sfnt_off00011e9b.bin
29ea9312427df48aefa0e49d422153a881caba24f4513ca6294273d0bc0aabd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 10124 bytes

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