Malicious PDF — malware analysis report

Static analysis result for SHA-256 b228b90234259700…

MALICIOUS

PDF

89.8 KB Created: 2021-06-29 00:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80fdc4268a2ae012c9da805bc402b9c3 SHA-1: 2e9d6e81e0437ae4084842be895c9d92539a6f73 SHA-256: b228b9023425970043463e97234b6deb3adeafdff73eaeb000626284ed5edfd0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links to potentially malicious domains is a strong indicator of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69a424996b5c00cd05082d3618495913/47633680159.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5abdc492---bepivijiwaradan.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d83a612838393fb1b4593c26408c130/49233518196.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///pefesitafimiponu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7184b56bf36a68add73c26b3647d4563/55744859319.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/32103788371.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/576af032a9b75316d03a6295e0bf9202/84920569485.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/26527918362.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ab4sdlrpagi01cof778h0au0v2/87826503171.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bee524bea---suzufukavale.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdce579a91---83334017602.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/vaguvopumogadone.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/21cb4bd78082668929d768620eb7d1d5/52335130268.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/vedagajakabokexe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03aa177716---64604936476.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a87855662152f8fc8837927a840e979d/42858285804.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/33066969090.pdfIn PDF document text
    • https://sbufficio.it/file/76259034783.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/41936887643.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/jojowizofovudabuga.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/31738690628.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/74536207083.pdfIn PDF document text
    • https://artbynela.com/uploads/file/35275305650.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/343d3e8a1eec5c83b1fdff682fb7bb6e/24427231574.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5d311fb7---89281379798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=multiplying+rational+expressions+calculatorPDF 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_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 18540 bytes
SHA-256: 67237d7600a1c6d1620e1ccaa6bc0378d0d6016afac21adc7d4afd3fc3344e02
font_01_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 10860 bytes
SHA-256: 62e673ada2996f6f74ecf8fd9b6fd00c2dba1f3c7e4cc8733a010ab79327f83a
font_02_sfnt_off000141dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1