Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1920ea73b2806f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 17:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f2ae0cc97c0ed2feaf2e0e9e7da27a6 SHA-1: 3a801aa7859c95ae1cbad3380542e59236621d18 SHA-256: 5f1920ea73b2806ff32877660af843590d15faf528b7b65ae62ac3a664f329d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many hosted on disposable domains or compromised CMS uploads, reinforces the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e74adf270---77530464079.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16105d39310de7---pegofot.pdfIn PDF document text
    • https://susta.vn/userfiles/file/42233755864.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/90777033435.pdfIn PDF document text
    • https://luminex.pl/upload/file/44691000414.pdfIn PDF document text
    • http://santabruna.cl/upload/file/gofubezuvutevab.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/simefitobeguvel.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb31a41230---xinelogumolomiful.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e55d693a---felejivuxe.pdfIn PDF document text
    • https://tcremich.lu/files/files/sujuworezakow.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nbbfup3rvvfproo89uail0bkmq/zojabigezosegid.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/82eebd0dfcabf88aece0545146ebdf71/zezivilugisibujetipov.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/80434718038.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82feaac6ec---wetof.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210730025155195857wn8xrw.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/gewejajexiki.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/rakanolulonidujigup.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160811c8c2ec59---zogidowazaponifezunetovak.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/tuvamazijumojewesulawifev.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/05f88af815ad6e06890d048ddb79ae64/95630593171.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d028c50f---donika.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/46386755438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=basic+life+support+%28bls%29+provider+manual+by+american+heart+associationPDF 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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 18284 bytes
SHA-256: 0c04b64cc131f608d785fd59cda650426bb23b8c6d8d96a1eab6456a9d59cb99
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 11516 bytes
SHA-256: 9e28e350ba1c8568965a49ba4a9d46671c6335deeb9e01209ce11fdeea93dae8
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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