Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f48261ae0dc0d4…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 03:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb02ba460df50e5ff1deabbe3a454d1d SHA-1: 19104d24042092a00837ce2cbad454293937bb8c SHA-256: a5f48261ae0dc0d4c242ad2dd2d91deeeabf9c2ef19e1bf45a3398807c3e34c8
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest a malicious link farm designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://i-p-p-c.com/ckfinder/userfiles/files/58881794639.pdf In PDF document text
    • http://canxetaidientu.com/images/file/xagafubot.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/57143200969.pdfIn PDF document text
    • http://health-bridge.in/upload/file/libebewifufogog.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714eca7a95---66869868189.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/nuzopuzugejimo.pdfIn PDF document text
    • http://ttc-investco.com/img/files/33828804969.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/kogaxiluguvigiwekenij.pdfIn PDF document text
    • https://superpart.com/files/73786038013.pdfIn PDF document text
    • http://abwessex.com/uploads/files/fazavazu.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/97142668214.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef722c47f---47411506984.pdfIn PDF document text
    • https://andana.us/files/files/mesenulonujeso.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_18298F0F97C8BFF0.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21574432890.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/viwokesijupasederiw.pdfIn PDF document text
    • http://gr-chem.com/upload/files/70150730730.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/28467852120.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4aa07257---gazezofuk.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/69397442786.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/xenofugotusajegepikuxibi.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/beluwokorivuj.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/wujejifovijekoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=classic+cinema+online+freePDF 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_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 17528 bytes
SHA-256: 88d4f6229af58dc45b83012887e4471d308c4a38d83088f1c80cfc7f74948f97
font_01_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10432 bytes
SHA-256: 9cd947166320c6e7504431ff9e3a8d4b016158a22f3fd089a9377509d2c7c703
font_02_sfnt_off00013175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1