Malicious PDF — malware analysis report

Static analysis result for SHA-256 5465ad2bbe783c4a…

MALICIOUS

PDF

96.4 KB Created: 2021-09-08 08:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aacbdc63ba4cf7f570f0c44732de11bc SHA-1: 329884039a753d269cee174f3414c31c9008559a SHA-256: 5465ad2bbe783c4acdc19d9457e88b037addb3ca1bd680f8903f59f413d1eeab
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to lead users to malicious content. ClamAV detected this file as a phishing trojan, and ML classification strongly indicated maliciousness. The presence of numerous external URIs and a link farm structure points towards an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://emmaushuis.org/pages/79418259124.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0d01748c624f394747262a70d3690ce9/kapolerever.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/pixugugokijifu.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/65755298749.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/xerubesazigutalenid.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/67546733969.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/27754927779.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/witolavup.pdfIn PDF document text
    • http://arablift.net/userfiles/file/nixufalaranilosarefomu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/76980331095.pdfIn PDF document text
    • https://lemanssrl.it/file/31631804010.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/722e9f133ff03999a1540067111e7454/nawejigelubeloxubisa.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41aa7b56c---wewugojuxijinafa.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/baxorapez.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/df4569326c75d542f4fd4c7df213df89/tuwumisunukajasux.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bd6d47a7---36731689651.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f753ca8cac---lalowilevuvuweviveginuvav.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mglmnu64i379mk7au8setkvv81/64551381077.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a570583313---91998192669.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/nekujologirebi.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gadapuxalezuripufotufogur.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1635c26805b7bd79f04208c82f293018/47255810884.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fd9073b0---37555826604.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eb8c5cebc89a7f004314280ce8138810/wigumezoxoranebavif.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/jirapivuwitarugoweruru.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50053c2c8---tisefivulujelanigok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=genetic+algorithm+in+data+mining+pdfPDF link annotation
    • 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_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9D 10940 bytes
SHA-256: 9724c1a2025f8ac2ac7cf434208c5b708f09ac3c06207d75eaec5f257c20ea8b
font_02_sfnt_off0001478c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478C 17252 bytes
SHA-256: 1791e3760ef79e2d52de413ad34c4c1ed7ff8f849ab9e5465a55b71d137726ca

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