Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c91bc319859b47…

MALICIOUS

PDF

75.5 KB Created: 2021-08-28 05:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e86235078f2b719db209b72927b33c3 SHA-1: af12a532bbf2017557ced944df417e0321c44d33 SHA-256: 06c91bc319859b470a78aa5a3fde130b612b7c478dd3580892d6cfc78d7d85ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure as a link farm is a common tactic to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://synerhu.ru/uplcv?utm_term=what+is+difference+between+data+analysis+and+data+analytics PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a2545867abd5df7f67977797d2984085/6687677448.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/dogutilisunitigiwawetinu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f8c4e7fc---tusegafiwefivamalunupid.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4f577564---92267103839.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b095dce061d---xawani.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/topon.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/xuxamebalivugogoj.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-26/20210826003427581342.pdfIn PDF document text
    • http://cy2hand.com/userfiles/biliwiriwodorase.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/73162867447.pdfIn PDF document text
    • https://luminex.pl/upload/file/zekokobetutafakezojibiwo.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/vivikewewewenavofobu.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/nosuferowifinimumegile.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/zivitumoluzowalupi.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106160058547177.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/54470956004.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gixamux.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/zekirewakelokuj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c66ea383---vonagaxuwumifuwemotalizo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6f64fb60ee28fea49cca0ab44d05d356/bazupeguwizedelaxase.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/19177093629.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02670ca294---8162580377.pdfIn PDF document text
    • 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_off0000c16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16E 17624 bytes
SHA-256: b1d35bf7c402078313509c15480770ac2cfae9147b19749cd6a342deaa3588ae
font_01_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10788 bytes
SHA-256: 1c69adfc2448b81965af6ec5608bcb3a7946b81b79b0e7fe05a4324406d0b541