Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af0491b58c93acd…

MALICIOUS

PDF

82.5 KB Created: 2021-08-17 20:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 726277e96f5512fa66b6cd2c3301cbbb SHA-1: 376ab709fdbfaef1039d7cd267f1a4734c30cbc6 SHA-256: 1af0491b58c93acdeecbe723d284936108577462d70bf4dfdd20706e56567e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://synerhu.ru/uplcv?utm_term=can+u+replace+a+kindle+battery
    • https://bestcoloringpages.com/userfiles/file/fajiduvimukelizite.pdf
    • https://nepalonetours.com/userfiles/files/59671396872.pdf
    • http://gibisch.com/files/files/6251548472.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c63605bb---bipapanujatafabel.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d643799e4dc---93889427569.pdf
    • http://darstin.com/userfiles/files/jidapeduviliwigijamesu.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/969dhknk7n4b8u8g9edd7k9ccu/rojilidadolovidujowe.pdf
    • https://burlingame.com/wysiwygfiles/file/43644831710.pdf
    • https://ludifrance.fr/userfiles/file/numudokowivikiwaso.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ddf076389---60082782118.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kgpicl3jokcn4okp8mnjvm7b43/fojesugusipiruketapijod.pdf
    • http://sns.hu/_user/file/wibizezapep.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d2f7b4ee---51177253133.pdf
    • http://beautybybelief.com/admin/images/file/fomumufel.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b75e3c59---gaxelak.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/836c125715d77e9effc9249c34bc033a/36341970240.pdf
    • http://studiocastigli.eu/userfiles/files/woxerusafetepajarig.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4bd2f60c---riwevix.pdf
    • http://uptownchantilly.com/uploads/files/xiwogekivekadotobaxivoj.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f053e96388---27628748895.pdf
    • http://tysons-cafe.com/uploads/files/95865503094.pdf
    • http://ankaser.com/userfiles/file/puxifademinorax.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dcd54dea9---60870967370.pdf
    • http://aaaexpressac.com/userfiles/file/dikodinajomexilajuzofij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de70.bin
7a182d8c537ad9ecf767cd3a56c60bcf37b7e7530b771c7e42eb6b55f0653a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 17040 bytes
font_01_sfnt_off00010acc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 16792 bytes
font_02_sfnt_off000122e3.bin
7aa749f1d7ce9571b91f99656023958d653418e98806b1cd2f77798eb5d55a92
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 10696 bytes