Malicious PDF — malware analysis report

Static analysis result for SHA-256 928184db4e7f0a40…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 19:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2c0a3379344db8818013ee16767476c SHA-1: 0a271ec3898567980263c15d52110e504494746b SHA-256: 928184db4e7f0a40a847f04f8c39790c64dc131f2455d9e71b4e3e2816b758bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to lure victims to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=pdf+redaction+freeware PDF link annotation
    • https://infotechb2blite.com/bot/ckfinder/uf/files/88537684705.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dadd3f1ccfb---28325479203.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/27873327931.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/63634415759.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fe5baf7d2f2ad55b92bddb8dd0a15bc3/81362788198.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e2dae12143f9a182d78b308aaf7b02d1/45061622022.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rigetedamifagakimoxake.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a6b8589fc517161fe443275dfe1f07e2/kuxijigawisamuberajezetex.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52000079045.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3003ecc3e---90881004069.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/51660750755.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5708a5080bc71a325b79cc8844e91958/megumedezisoxizuvu.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/28778863720.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/38068670952.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d21a3db1---lanejojuvawasagan.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/41687464232.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2u24i1rcc8m0kinnb28utfjjab/76081316429.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607757bc19882---vezuneletelajikova.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/nupogozetanedamev.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b328bd17---18251619519.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9a44856ca2b31af89d59b9b5fd472afc/61582552557.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210809001645.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d962dca9---76309540926.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 17600 bytes
SHA-256: 544a9ab552f1de5da27b7742112e47c83232eeee797304e586b763b034474ea0
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 10344 bytes
SHA-256: f55318bf44a8925b66d49cfca1f413ac6b3507e78a943c83a866398964326d95

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