Malicious PDF — malware analysis report

Static analysis result for SHA-256 6334af63238c5e2d…

MALICIOUS

PDF

83.6 KB Created: 2021-07-12 23:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 832dfaf14b9d3c7ca1da87a9dff2db15 SHA-1: 5930ab54e70521187e079ae0257f653e2d63c5e0 SHA-256: 6334af63238c5e2dfcb37eba1b32efddffb81e9430f3f0fe32912987e8af362a
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of a 'download button' lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=numbness+on+face
    • https://ambalatender.com/upload/files/mawado.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f816f788f8---51777879703.pdf
    • http://cissi.it/userfiles/files/96485952603.pdf
    • https://ahreco.com/uploads/news_file/nisapagulamimugisuge.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3e7c6f4cee2c00d91b92008e9048bbf6/riwututaxifalo.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/54057119903.pdf
    • https://leganordavigliana.it/uploads/file/95157726314.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e71874a2d97---xudix.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9643cd053a---vologuduxofopaz.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f86c383c---rikiwuduju.pdf
    • https://mfdesign.hu/files/file/54443984772.pdf
    • http://ji-tien.com/userfiles/file/zekirifolov.pdf
    • https://bawwabatrizq.com/userfiles/file/4718356259.pdf
    • http://enovosti.info/ckfinder/userfiles/files/bukimedavaluwo.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/cf220afc3ecd50e56dac2c7dc40c6e70/vemabowabejikiz.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf3f657143---81273368667.pdf
    • http://labonscafe.com/userfiles/kabofosabifomijovo.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/juloxokowaka.pdf
    • http://commune-bourre.com/userfiles/file/durar.pdf
    • http://tz5168.com/uploadfile/image/2021/05/24/file/20210524_091235_115.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de89ae0be3---3163487312.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0a00b147584cd6f8dab3bf6b8de36e75/pewesizixejowir.pdf
    • http://aarogyamedico.com/userfiles/file/kunipijab.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d93983da8---99218694607.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f9807df0---bajatitibome.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_off0000e6b7.bin
f6e8622aa239ced3e74818fbe63a08040bf91005036929648300bc7b83e62984
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 16864 bytes
font_01_sfnt_off0001119a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 16792 bytes
font_02_sfnt_off000129b1.bin
9adb908d5cf92feef7fb15b11a6f96f0c7079fb058a9b01befda28ce39f48266
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 10376 bytes