Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ac098a3b5bf1b1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 10:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f43a1de0b19bf505eca59a7d044e4214 SHA-1: d9bb0d7aef8ef68ef8c1efee83ea9542b823db44 SHA-256: 34ac098a3b5bf1b191e98d31528e02fcc02065449a32ae8d8f00d2c5d04eef02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised content management systems. The heuristic firings indicate a pattern of SEO manipulation and link farming on disposable hosting, suggesting an attempt to distribute malicious content or phish users. ClamAV detection further confirms the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=klondike+cracked+apk
    • https://nibrasimansch.com/userfiles/files/15458052330.pdf
    • http://redeyeldn.com/userfiles/file/vijubebuditotubebizu.pdf
    • http://derkwoo.com/upload/editor/files/naberagojasuwitesu.pdf
    • http://1qjd.com/upload/files/2021-09-03-12-37-17-Qx36q7Yt.pdf
    • https://fullgame.hu/uploads/files/vezerome.pdf
    • http://evo-models.com/uploads/userfiles/files/gutofidokewuwa.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/losurujozoz.pdf
    • http://top1np.com/ckfinder/userfiles/files/kuzusezogonukaloruxote.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a02b1a04---27098408510.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/35247150450.pdf
    • https://casaalu.com/luutru/files/30658368590.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jov8mme2hhltq91qqolmc6l2ul/25708560656.pdf
    • http://lamekatus.com/uploads/ckeditor/files/lalulinoruduwezisopawa.pdf
    • http://93564497.com/userfiles/52338816329.pdf
    • https://autoskola-scp.com/files/99296736477.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320d9092271---94980399968.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/vodudagutumab.pdf
    • http://halaljones.com/uploads/files/labin.pdf
    • http://wernitznigg.at/files/kodev.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kim71okblruj38etkig2dllb97/letagodo.pdf
    • https://thuaphatlaihanoi.net/uploads/files/94022809963.pdf
    • http://runhouchem.com/upload/files/rimuxapegijupujo.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcaa7c087f---sisaxonebujuxaduzele.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_off0000b6e7.bin
3959c4d9abbea8c9f60dafe3e4e248e9fd96b92d5ad30bc441f39c0b7adb8ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E7 17064 bytes
font_01_sfnt_off0000e2ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 16792 bytes
font_02_sfnt_off0000fb05.bin
9d8448d50f938a2eaee177a94b85c4b6f4724c4febec6a2610c226b5f5d1cfcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 10324 bytes

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