Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a39e4c731ccb5e…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 20:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9bd78fe63854a62c98bfde7097c20657 SHA-1: 5aaf3035ce149149628eb93a581fd8f433d3eb92 SHA-256: a3a39e4c731ccb5e57fec70dddc9b3828f06b6cea676c3067de071415c2923ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely serves to redirect the user to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d4e0b268---kigefodilafe.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/31896076481.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/12/xurifulezazezaju.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd573a0ed8c---vifofowuw.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/wogopopabon.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/60686810594.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/riromebebefowenipi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080076782af2---56679021513.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/814128d5298f5d87fd875d19db808ffe/xowemasufeseminaxeduge.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/18566901718.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/33404654017.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/19999786646.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8679d08d---55497604062.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/48485639126.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/45339999935.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/84134648741.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/36f8199375bf776660b972441ba026e9/29699516905.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/92afl2r96pnd4j46nv96ev1fnd/2274191440.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa02894f3---mixegujizixonejug.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/kudinige.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7948aec9---wobikalekunadoviwam.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fd940411aa241a84b85f9580f23928e9/89573353098.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/52907533948.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f8a48decdfb6ae897d43f29bbbcaaf7b/fefod.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9rg61or3r760g3igbl7k43c0d2/xajerebawidilas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=thank+you+lord+song+downloadPDF 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_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 17300 bytes
SHA-256: 4590b2417601bfdf4a96463c8fc4125ed61000ed171437041c014a7c418f84b5
font_01_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 10560 bytes
SHA-256: e0cc769489bcd7548a83c17a8d565509035bd0921da7c23b0c14720d2ab9edd5