Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1af7797e7df2ee…

MALICIOUS

PDF

99.1 KB Created: 2021-07-29 20:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd1233794468fb673293b1848c4989a3 SHA-1: 91bb8cdb04e8153fba020dd46636d6723d4ae37d SHA-256: 3a1af7797e7df2eeb87bc8def8864fce7172679ab488c27a01732201884cb282
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and ML classifiers as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning and deliver malware. No scripts were extracted, but the overall pattern suggests a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=cade+simu+a+pdf+online PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160734ead51201---52489635979.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/js9dj7oalkc5g1dlt8h9j5k3v4/xujufired.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a01952fdf55786f767d28c503cc4943a/30914542886.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/vasuva.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/falimivitawunevomunokus.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa390ad65---81050092802.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sakarotetenujekefusibu.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/muloxosiwatifofemapiped.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4gb3bbbihlgnds950rieq938r6/72367321758.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a422ca0464a---75831535452.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/15726741191.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/895efdaf3468c65e692c939d42025f85/dakubosob.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tusixibopak.pdfIn PDF document text
    • https://vientangluc.com/upload/files/28840432241.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/70490113387.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/e027d896ed37a832a9e25d59f91b3f0e/56438807459.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/letiraxufaf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826ebf70da6---serazutujavotewazuro.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/gewifajuvunozewefetizitu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hpq036g1dot2039bemv5aa14o1/56647298582.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1bdf3e99b744e4ac35fafa7ed5766d2e/43038757493.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c912f99a---66297443736.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/59437964555.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/66356404728.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 19148 bytes
SHA-256: 3fe33875866b83445c2c5e3677f892dda3f4b71b6e9122ceb0c0012a0a62db3d
font_01_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 10592 bytes
SHA-256: 4ab7747e00a264de7381aca7d26f4459e9ccb1447b16f509a31bf8ba3188f05a
font_02_sfnt_off000146a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB9 19140 bytes
SHA-256: ebbde6167639c357f5f97369fd63120c96c76e1f61384707febb80c39a63c0c7

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