Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fe06baee548120…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 05:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5790f24fc3bd5c91d42d6816ef56899a SHA-1: efa1064a4930c8cce79506629e75ad5a0ba1b9ca SHA-256: a3fe06baee548120d2bc71d1e41ff21baae3afd5bd5e597db539b6d065f07d9f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=top+notch+fundamentals+b+third+edition+pdf PDF link annotation
    • http://ciaooo.ru/uploades/userfiles/file/vegoripafazixodotoje.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/vofotelironiragozevo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///75365930386.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/dulibikite.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mn12judp2tjbe82b00rkc9dcjt/73157210932.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9bc7b7b71120abeb0d11f8d204978792/gezejobizix.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608938437aa72---531033335.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/sr1b0t4nmd7up236hkgh0om0b3/41001302381.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/11a79bb9717a300a55b981100675958c/65267392447.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d1387c0a---9841395719.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1fjbolmdvuccpn3bfm6b3d5rsd/90021117962.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b897105059---64474780273.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa59079ce---87514360175.pdfIn PDF document text
    • http://fotossc.pl/_files/file/87803116302.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210724061355.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/ofmpcpors3kg2m4jurj98acfpk/19493115531.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/35337674305.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/rovipiwelupu.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/debezilasatajubizokusuzij.pdfIn PDF document text
    • http://asfalon.com/__files/file/lorazixa.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd770f2cc05---fisedewubovedamil.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/0dc97d689b4fe9f71234a5a3fe5178f3/gaseloxesutuzenuf.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/2249788470.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/28802729050.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e301ce6ac---41377520169.pdfIn PDF document text
    • 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_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 11088 bytes
SHA-256: 923a1d62674f79996ca80a80a8e53a66dbb282a366e8943ea5fd3b3c8a33918e
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 17628 bytes
SHA-256: 026261101886b3cf4514c9fcd2f32ebf8ddbc8261885602cb28b17659b073489

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