Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7ba6245bf1670c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 14:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 621e6750bf802928c66a7f156384c677 SHA-1: 2c0bb0f487f36d181112c3822c13d64d2ee54b22 SHA-256: fe7ba6245bf1670ce5dbec4fcd71c2e799724a3e32449a6acc51b7b38c596e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to redirect users to phishing or scam websites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://catamma.ru/uplcv?utm_term=nexus+5x+bootloop PDF link annotation
    • http://carrozzeriardue.it/userfiles/files/78280527551.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/17099346479.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d41901bd9f56db49280ecb2c9aea22cc/bipajumekokadaxosapiz.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/3442099509.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/majejoro.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/815720507.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/migemoxebe.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/kunemuvubumevox.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146c5548db0d---lojidutejazeforepinuj.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614554c623a48---kuwiforabotofavumu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/38245909917.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/powafonunuxufibigafu.pdfIn PDF document text
    • https://superchills.com/userfiles/file/96057683777.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/jeloxavozoso.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/zijuzodunifefuk.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fiwukimumojopivezos.pdfIn PDF document text
    • https://emmaushuis.org/pages/12708190405.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/dabadodejetal.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/88955223907.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/69311349257.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lugelosipefolegujide.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/93504730581.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/4725952002.pdfIn PDF document text
    • http://rsentco.com/upload/file/jebenasorevalitejij.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/58789250991.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/rafuvegenimesezilina.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614093acb37d9---34069476256.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_off0000c3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F4 16292 bytes
SHA-256: ef8f1867c9669c24f8f933460fc5b9dc0a8ec1397daf485649bbea2103b0903d
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 10240 bytes
SHA-256: ebbf396d0bd4ac2e064862c30a20747b69beb706742064357466b349c073d90f

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