Malicious PDF — malware analysis report

Static analysis result for SHA-256 7deb2d987e3f8dbc…

MALICIOUS

PDF

93.7 KB Created: 2021-07-03 00:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 870f37030550b560cdeeb7891cf7d07c SHA-1: a4a65213e85fc79080d5268c073c60c8733ad0e8 SHA-256: 7deb2d987e3f8dbc17d11dfb0353f706f32285adeb9453cc6a73dce88d33de20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to trick users into downloading further malware.

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://airbays.com/userfiles/file/pozovasasusip.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a65148f1---85993009834.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c517265c6d2---16874318887.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/87061183543.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e706cce08---8946709034.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae888798556---53618714469.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/21044570749.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/c9ji69p216bn5ildfhj3fq3050/87248260347.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/27902335419.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ee5ceb7781ccd05716861e769584431a/jiruxetav.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hnsqjt834vrgruvf94lelbppsm/ziduralaxawoxaf.pdfIn PDF document text
    • https://actorconseil.com/files/file/67974402872.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d268f2f30---79989266820.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/29e38c13dbc76d1af225516eb7472b1a/63777329488.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/vopijojutiwejapon.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/wakemiwe.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tatuxujuxirajelitodirux.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2dc30374d---duzujolizetemorebodifap.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zugogu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/lomipoxalef.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d496b6a36fb---64004867290.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5d6d290b---51562287396.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/07o50r7155jicod5ujc3jb7a73/54900791194.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ptrvf0ss22ubj5gmrtecqb6msq/dadezela.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f13ab160e14fbe6daae2fc7896938747/lolipijosofa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b532c93ebad---71309429824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=spanish+for+soulPDF 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_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 19036 bytes
SHA-256: 494390944e069257d159a54601cfd0faec906f1ad75c1cc46e365d3492ca1e20
font_01_sfnt_off00013a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 10400 bytes
SHA-256: fdd493c4507faf21e3fadb557b4b04de9e327ee87d6b2ef96eb7acc7689a32ed
font_02_sfnt_off000151ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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