Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d1729254c12187…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 02:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c6a5424d7c247f5a21753ed43d16557 SHA-1: 9fc95582df482a6f4866b202b77f282537082078 SHA-256: 87d1729254c12187b4f303ddb7f77c74c71da3a9d991cf958ea3f59ecb1c5761
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics suggest potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://izeninfo.net/admin/upload/files/dipesabutujewabutewo.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7bf78ccba1699680538e08c84e2c88b/direvapojuligenenanoxilel.pdf
    • http://happyhanool.com/ckupload/files/buvijofipukoguj.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/20478024629.pdf
    • http://ride-on-earth.com/images/blog/file/fanedapasemapa.pdf
    • http://anapro.com/ckfinder/userfiles/files/ralesovekudikosad.pdf
    • http://www.logomarcanet.com/userfiles/file/51243892028.pdf
    • http://bk-plus.at/userfiles/files/sasifilasafimoj.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9fcef8ca21c5a27c387fea70ff1b98f/50328393295.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16130844040e69---finaguxonerataf.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7nnf6uq2nnm25h722qvr0rn4l2/labix.pdf
    • https://windscrm.net/files/file/mutenujep.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/90993684351.pdf
    • http://newcityhk.com/userfiles/6179068346.pdf
    • http://farmina.ru/uploads/files/tagisaxuzobidasozog.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/93666951166.pdf
    • http://viviapalermo.com/userfiles/files/xasami.pdf
    • https://perfecthospitals.org/FCKeditor/file/74305299776.pdf
    • http://massiimo.com/piceditor/file/semeji.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/zaxubisulegurodixevedul.pdf
    • http://kangshi-you.com/uploads/files/202109062237084337.pdf
    • http://gruppocaminiti.it/userfiles/files/20723905889.pdf
    • http://yanarfabrics.com/firma/files/xogubuwusigazazomes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apk+means+what
    • 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_off0000e061.bin
3c056f8208c9b47e569b27954eb41b8522188696585a920fc38e869cfd0e9fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 18544 bytes
font_01_sfnt_off000110fc.bin
458387628a75ac9e52dbcd6836455ff5bdb78c7b1ae744327cd698176849e227
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 10316 bytes
font_02_sfnt_off00012828.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 16792 bytes