Malicious PDF — malware analysis report

Static analysis result for SHA-256 71de6f216af20853…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 12:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29ac000ad4948bd8404aa686f0a24aca SHA-1: e3d8705e33780447c0bd1c759f88cf1f0147f26d SHA-256: 71de6f216af208530cd801b1ade321aaeda5c92fdbf74dd61ad0f5a74f1d5d51
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, while numerous, are primarily used to redirect users to potentially compromised websites or disposable hosting, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kentacademymiango.com/userfiles/file/piveloteremalovagegamop.pdf In PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/8723570447.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/37612972208.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/12288365046.pdfIn PDF document text
    • http://www.77ice.com/upload/files/tumivozenibifa.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/42364089594.pdfIn PDF document text
    • http://jonellchem.com/upload/files/xulusakovuzege.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zalomonolapidovuwep.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/96274723003.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/78141247773.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/83222958621.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/pojotin.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/63539274496.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912cbc6619---83856144212.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525852fad6---26528648102.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/23571396311.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109020151293127.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/ramonetetexo.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/15516195645.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/baxataxomunobeluxola.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/nevifodokinoguruv.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nb4rnnbr8dpkcql8of2rf7ubi5/kewow.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/32022854614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=stick+cricket+mod+apk+android+1PDF 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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 10680 bytes
SHA-256: 078683645c4b2754be39ea763490fe2b0da7e23daa2f9ad5a373575bc922cdb0
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 17852 bytes
SHA-256: 3c00e0c434d94aeeb113fb805a88fa21acfd6fb8c162e84c4cdf4b7640b05843