Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc034d18cde1489f…

MALICIOUS

PDF

90.0 KB Created: 2021-07-20 11:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a54e92037b5277f0d1bcf86cd9c5cd2 SHA-1: c311730af45da4e448a453faa5e7e7b57421619a SHA-256: bc034d18cde1489f1e3310aeb5bbf5ce4a4c8a0425c46ce14410e23063da6685
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://digireg.se/upload/420394889.pdf In PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/foreka.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0bf7d5185c271b6390a78eb1f742dbb3/44733813274.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/16455953450.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/26235722638.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/raxewafilume.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160de73ab2e76e---41603518203.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fce6deb6---6312788256.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3tdd5m8i860rjtaea3ftr3nt1o/12105377286.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845e4bcb885---momezigugekuleju.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/30513311785.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/jijimufol.pdfIn PDF document text
    • https://jagominum.com/contents//files/34557590787.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xamugafoxetidobi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/nedenazomo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54e37158d---bebawukexajolukav.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5d4232be86b597bdd2a117d7a81c60ce/85808146048.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c28bb791af20a74a350f8c7dc839eb4f/70427277935.pdfIn PDF document text
    • https://mavibusiness.it/file/94225483482.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/90875069683.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/48905bdd94850bdf75ec830631a60cb9/81883641910.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16097330285de8---vajid.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160959b96a9a49---19194957767.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/n6c3m9sm5bka19ecq4r11pbh6r/rironudekefawenexobevu.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/jarezaros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ss304+chemical+composition+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_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 11232 bytes
SHA-256: 51253fe7bfb7dc6476feaeffed5518564ee639bda30479cf83d92325875d2fb6
font_01_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 17708 bytes
SHA-256: 7c6b6b64b037f054317f7cbe04334c6d79db1d03e20a3a1afd30d067a307b903
font_02_sfnt_off00014272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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