Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e7134855a45c05…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 16:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28a871c11de2bb009afff3608da856fc SHA-1: 39e22a8e7b53c12abd1a606d4197d72aebd046f0 SHA-256: 83e7134855a45c05f4cbf3e4fbf9d309f560fc09be3158809738e7239a0b474a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for a link farm, suggesting an attempt to obscure malicious activity. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=financial+analysis+with+microsoft+excel+timothy+mayes+pdf PDF link annotation
    • https://seeandhearbetter.ie/img/shop//contents/rakezonapujutoto.pdfIn PDF document text
    • https://lecachet.fr/docs/files/lilexopobu.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/70834724469.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/75040046316.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc23dfab39a---86889234668.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/73609207656.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/14267960317.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/e5d64c225e04a32633a923fee305076a/93469178147.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/mifiremup.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/38768019054.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/tigixupawufonemuvubebaze.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8650e6c1e---pegelasigimiwum.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/9548801266.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8fe04f5cfa37ddc2787bbcaf1489f1ee/lukexobafofe.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tejaxaruguxos.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b922a83ead6---65314584893.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/vizunivibilek.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fvudtngj6bc37h0i6e19tollva/mipumalerenu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/bitekewadix.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c40e132f9---63960346289.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/tazabogize.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e659f03b868d0830e332fdfcd4f0f8c1/daminagomapi.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/24438042067.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/senedivuzurewirukuvadagog.pdfIn PDF document text
    • https://ysh.my/userfiles/file/58241334219.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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 11164 bytes
SHA-256: 2819ea33a9d6705e4eeea354090f61dd92123de774659d9917359ecf7fdeead9
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 17148 bytes
SHA-256: 6df46e7d200333e77245d601ffac50fa50ecd58473b5f4c9f68ab273ea328c12

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