Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e30c754567f1739…

MALICIOUS

PDF

75.3 KB Created: 2021-08-21 01:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 754c6816542d16c29a6acf5cb019a138 SHA-1: 71ba27f85ec6bfffad9930e5c73ce41673fe06ff SHA-256: 6e30c754567f173950d9ff0d3f757f3517542eb71e54fff0b09b702763350211
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://fszhenjia.com/upfolder/e/files/20210722073450.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8bf42f4e50661538bfaa91e9aa0f63c/wivoduwogesowazapuvu.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/41236803308.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/73b691ce2cb1019a10b876f5eb20d23e/78700210968.pdfIn PDF document text
    • http://waypl.pl/upload/File/vavigaxovofelozo.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/474f5985f5b549f9fca248c8043cc0d3/togilujug.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/05d198df202809f79528a63640cacc1f/separirum.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d297b58ed35a581e065f6dd3f81daa6a/wusakakemoreralel.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc49cff5f---rimujisiranovulakaferuf.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f3a457895f54867d8f0ad366c0fb137/xutewaj.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/rakujovisemijiwajekomi.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/popiwemidexazikixerafo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0381cc2402---4374192443.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/soxobusixifaxolo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/86137139309.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6867de311---6672672329.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/zopukinip.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ki5tksvut9m840q30s7dqp4l4l/10829044017.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/95990227940.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/41276168231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cancion+cielito+lindo+letra+y+acordesPDF 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_off0000c11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11B 10508 bytes
SHA-256: 21d72604f6e3a91bd6ffcaa2201e1aff1d4e0713b7ffa74590bcac432d824655
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 17828 bytes
SHA-256: 6aa42fa44129a84f33c47eda6f3a7229ade6b3d7ccc5bf509b68b8d22e6d31c7
font_02_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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