Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6dccbb4517ea5c…

MALICIOUS

PDF

95.7 KB Created: 2021-07-30 04:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1acc27047e94774fe5865cbc579a4fc0 SHA-1: 36752b7b454ea05ac52117c9b26ab4b4728208f1 SHA-256: 3c6dccbb4517ea5cc9a02ce758c514f6c9b6707fc354be5a247cde45931bcff4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the heuristic findings indicate an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2d1e92fa---wijiguketogegedogapi.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca06919fb---75315538907.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/16600013039.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2121f3d4b---zeverikotufukunewa.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/sowima.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/84882349236.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b060dd75a3c---fejulidilufew.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/457f5dacb122cc65c8c5a708eeb6c197/87899128878.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090030b57179---kisuwilejuzikotiguni.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/molosim.pdfIn PDF document text
    • https://afayl.com/userfiles/file/49671911002.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609595929e9d6---ginuwizuwefuvune.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a927f8029d1---ginaposizejoloxotepudel.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ba0842d5d1d87839fca2c4626aaacf92/5354282143.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3947fe7556---52555124473.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/nujudorubegodorijegapo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb56a0cda---zifofetozewarala.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160720ae908b37---21479415855.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/38979434032.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a957dm71cvdr4ri1h41rj2v4m3/66344116942.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/e80c6f103fe93626a165bfa497ec3b19/85473266317.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/46627494522.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f50d6e67b---wugunuf.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/xinobijezovibupuzexuroxe.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/94114902833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fce+speaking+exam+practice+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_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 17544 bytes
SHA-256: 991797b69098804da442684febf70c827806a67eff0af7c4374d868bf0304b68
font_01_sfnt_off00013f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15774 10968 bytes
SHA-256: e837ccc76e66349f41540ad1cfad9c49ee7f3e8a8137eb84e2588a82c82d6f83