Malicious PDF — malware analysis report

Static analysis result for SHA-256 683c203b4a60511d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 04:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2821dd48889e2351993afb9a0427070 SHA-1: f5056cd8a0831ddc630f1cb68904a6c9836cc07c SHA-256: 683c203b4a60511d1412cde58334424eee68f20744989a709a7763a33c6cd5af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://binarbaidrealestate.com/public_html/userfiles/file/42373688734.pdf In PDF document text
    • http://pushgroup.lv/userfiles/files/buviwofesetuf.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429110235059.pdfIn PDF document text
    • http://grandfiltr.com/files/file/fofejuza.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5pc2mdr4hqohuutd7h108mbg58/nixufamefikar.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/94664329657.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/nejulawapomipobotirenu.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kuwumevimavuzo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b541ac33---21292658474.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/86a8f1f5d6c3f386e8643fc422952af1/kokilotakexijizuvatobe.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e4303aba---lejomibovemimap.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/nubixiruguti.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/gavofodevibozisunemag.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/350eba36347ae63b791608d9153b6abe/kumejafilomevifete.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e30c732e0b7404e3fb48939901865ee5/nuxaboperifumoxigidi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bdf480130e8fef8349051bdc87e23bca/77076666097.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46e8e1b40---57767501111.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/18107547165.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210623201538.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/80lfei2s5e4tfb6hdmjopoukj4/60470492751.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/48468781295.pdfIn PDF document text
    • http://brlairport.com/images/file/55252676230.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949176c1ddd---48113562449.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/remikexikazotaxevog.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/nijabusenala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kinds+of+learning+disabilities+pdfPDF 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_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 17004 bytes
SHA-256: 9880461c314ad13f8f92c54b27a7eaf8795d260d5162c9b7c6c7163af5f4d0e8
font_02_sfnt_off00012d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 10804 bytes
SHA-256: 8f7cac48e346dd1ced05e05e421b172e8200b967b6bf781cd0b64af80e207f86