Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fb110b55693c69…

MALICIOUS

PDF

96.6 KB Created: 2021-07-08 00:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da69c05bf1f472ccf21a4dd316fdab83 SHA-1: b93e07621622b8a6e322bc92151b9de44a0eb6fd SHA-256: 06fb110b55693c69ccdea6b002d4cbbc0e6e4cac9b8657300d620b69968faacd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, forming a link farm designed to redirect users. The primary attack pattern appears to be a phishing lure, likely delivered as a spearphishing attachment, aiming to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c57a373f3---82506366293.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/89361652127.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dubupevagonuzodamavoli.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/78779135655.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/fopapajirofaxazofiwaf.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce72e85b91---19004985772.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/ripafuxijepes.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/tukudigag.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/96541834557.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/gajegomeregasadagubumi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f6de2f50---24807043592.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hdti50vpcckn905ibio8oupf2v/12343389062.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160888c7813ca4---63396170066.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948881a0593---39389468899.pdfIn PDF document text
    • https://doganagolosa.it/file/donuzatavozigusato.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/62089860408.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/97ea0dcfee764ea454728c4614c2b1b6/99126938745.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd0aa5c29---xegudukanilumu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jm72rb3l18j05ol6fqf8qmng56/13501060121.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871fce165fa---96451221315.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5d9ac68d9d8b735008c4f05767aaa78b/jafotokotabovoba.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qborusv7phub0tgt13365q9b05/feles.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/verilimidajove.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090947df1b84---16357832480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=brain+quiz+game+answersPDF 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_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10632 bytes
SHA-256: 7f34b31371e386b1f693c1728f7dcaae3f97514ab01419e65772f2a89c1832ae
font_01_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CC 18244 bytes
SHA-256: 041096210797cbe9a3b1072c66e27b46fc6b99cd931af1071da255d4afa87962