Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c73f09c98c95fd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 11:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b0e18abe4df4d6058450025e2707058 SHA-1: c5676f4cbed5e3bb071d692d98754101b15ffc77 SHA-256: 26c73f09c98c95fd4ac4dba26d6b144323963994ac6d21bcbc8253121db5513c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

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://faresaldabbous.com/uploads/files/situf.pdf In PDF document text
    • http://ladna.pl/user_images/file/mitizixurilubuf.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/756488925.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/8530163447.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/39644261912.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/xirofipukupafutofafezena.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/xozosiwun.pdfIn PDF document text
    • https://phnews.ro/files/file/gafalewiwag.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/pijajarewewifu.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/41646746644.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/fewatagame.pdfIn PDF document text
    • http://ifap.it/images/file/sogagopi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b2d1f3b7---62123559674.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/zabebotivuzevukep.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6a2fdb0fab71f8512c6dabd13c5272c7/vopuza.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/41767825174.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/1902530607.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/db7b9fa8f39183c544c2c683a0cc2d41/vevarazuliwinalexupopogi.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/bixovak.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/robepojoduxamad.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/77144822944.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zaketobu.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xaxolurapux.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/13622478180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mod+version+of+candy+crushPDF 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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 10700 bytes
SHA-256: 2f6bdb6264cd5e769b357eab1a2a6f2f0291ca042418d0b81f9f30c681809d6a
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 17584 bytes
SHA-256: d6557446bde029ab1e04d66d1de8a43c3dcca20b22368e3f64f71a99648a647e

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