Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f7d00ff6afb2ac…

MALICIOUS

PDF

89.9 KB Created: 2021-07-29 23:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb7563f32cab5a841cfc6dc9c4a254f0 SHA-1: 3cbd0a25f62b70d24ba731fe07ad75f56f71d3b2 SHA-256: 65f7d00ff6afb2ac6ea83607cd8554d863f7e20bbc5add8f112e7ae875e1cdc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6a40df1bff5b41ff5db9486364d560c6/19523684050.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bffcc98bcd4---59329264859.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/gusofupuzagikek.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/fuduposofidevesajazunig.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/07f247809c6001806d2bc1f0d64e0c58/28584052854.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/kokigosedarewagalo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7b42d1782---99874862233.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609183a83b224---kepanisitosazuke.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b8c783f8---zofib.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/73521836811.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/86429826542.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71872ba19---kujumumoxapaxogibojupid.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27f74df08ebe51ee2ce9b6efbbd7424/24642550707.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/4e668e2b5416ee8c01470fe3c4e2bad5/jakiziranodag.pdfIn PDF document text
    • https://premium-house.uz/images/file/84281212769.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1pcrb0255715b6cjkrb2bltnsl/11860797185.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/funijebegipalova.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/pipemazegosef.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/63210124259.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160babb4d0423a---pozakibuta.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wafokusesolaluku.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/73443314369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=signals+and+systems+continuous+and+discrete+4th+edition+solutionsPDF 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_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 18948 bytes
SHA-256: 995d7960f5b3e3755b25bf54837111f0f5f55561184254c980bdf2c4618108ce
font_01_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6D 11184 bytes
SHA-256: 4a1a78a0441933514e2c0c1e238e89dbf8863b455225f738ff8c1928dfb55e98

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