Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c71afd0e067373d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 07:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b837ec0c89234aa626d9c57180bf9cff SHA-1: 49d6024c041c177efa0d972854f965fc35779437 SHA-256: 4c71afd0e067373dbee382ebe8b11317f9ff96d889ee334e975882dd4aaa7e76
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'LOLBin token sequence in document text' and the general nature of link farms indicate an attempt to trick users into downloading or navigating to harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=best+hide+app+for+android+without+root PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/26aud9ekce9hij7crepnd8mlj0/53881820578.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/pazamepumutika.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/66305970150.pdfIn PDF document text
    • http://offerparts.com/upload/files/26881776447.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/9440124236.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/55094072116.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/39a18eg7jr38hvnee1lg3rlv77/godixefizuninipi.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/gowekubeligivakonun.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/siduvorazinodejumasutivi.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/69529832173.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/wesakuburenaxidor.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/50720901601.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/42293799964.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/25148654633.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/31d73844e66225a4b7a78bad2e404856/69852404678.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xixeraliwululiguriken.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614755823163d---nudagibavixixelodin.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/safidip.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/43824907035.pdfIn PDF document text
    • http://teplospectr.ru/images/files/remujolamuvovilumejokaja.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/93971ad677de2c7060fae5f80d9f34e0/siwubixapibijegorufid.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d78fae717---24638034727.pdfIn PDF document text
    • http://cssh.es/img/file/favisex.pdfIn PDF document text
    • http://trivio.it/userfiles/files/17866076522.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64594620306.pdfIn PDF document text
    • https://adiwirawanbaliIn macro / runtime command snippet
    • 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10788 bytes
SHA-256: 8c669a570231b599ef38af30aff6dbb60be8089781ba907bb78d3928f0b55e14
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 18140 bytes
SHA-256: e6a5b2613c0e5c9ebe575e62666b1994b84f510791389a43ad8403e1b89bb978

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