Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2dcd58e7936722…

MALICIOUS

PDF

70.5 KB Created: 2021-09-08 10:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c2a19beffd0f4f037ddac3783c88d67 SHA-1: 5445fa28c011235790a321cace9b59c2c6f4e6a8 SHA-256: 5f2dcd58e7936722e7b549b56d6e9f36bf4e09f52859bd46d8e56a7fb79fc57f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is unreadable, but the heuristics indicate a focus on external links and potentially SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://m3hotels.com/userfiles/file/sebutexemogononazemi.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cdccb65ccbc---woxifonuxevupegogimurarax.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/womisuxetinuwujam.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/nopifami.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c38cbf672e4---vigorejopulino.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/37948714039.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/pibagexilirituledibedez.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/17203334759.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/11846742141.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/gewamuxigeno.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bma28p85ccc0gltu964v2sa1ke/kowosoxep.pdfIn PDF document text
    • https://rm-parketi.si/uploads/10086792544.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/28231371565.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/nagepedevidigivavulaludif.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/73650853687.pdfIn PDF document text
    • https://goodline.by/userfiles/file/veriwulemadumumurosixa.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/97572db8e9eba6f9db319afd3d98dfce/nenosapepegibul.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p1gb32rolgou76hvl3fqqjjs5m/26577999142.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3aebk39j8v9bgt158sirgqiggd/77205713355.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/kozujolanevatulutuwexinob.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5b7bf28c---matowuvijoroj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af070982b8---vizewiroko.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/32440679835.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/penufosuzafesurimopom.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/kewuwisebuvaledip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cell+organelles+worksheet+page+7PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73F 10696 bytes
SHA-256: fd26e172e3c87e0f01e0d26c25bd56ba1b5a3b53b8c1f4885f61a9931dce9927
font_01_sfnt_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 14576 bytes
SHA-256: b636dbc1030f76cd23811a36df6313ba02edd8e80c6c0cb53f725d4ce424c7c5