Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b36b353078561a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 19:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 274b505424a0134fd205d15e2446a645 SHA-1: b85567b315777eeb2c95896fe8c2794bca0f9bbf SHA-256: 60b36b353078561aa92de430702d3f05f7cca8948edead8564a0125befcb9acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure points to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cb806f90f32f16ca958f32de55b2cf63/nevejigesisobupufu.pdf In PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/31ad07bddba7bf8b7e79487cba02a50a/68670927755.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/eeb35ad1365d3b8a6f050067235518d4/39957240997.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/lixabuj.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7bfd2b38c1fd0002f76a55a7d37c0265/50368919302.pdfIn PDF document text
    • https://beaszemin.com/files/xivubuvuwipi.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/40506960278.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/9e9642f699038c40006e5bdb64f12992/jegiwur.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/29171042732.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9759b66a3---zulunu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/76299785810.pdfIn PDF document text
    • http://sinoorchids.com/image/file/javujep.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cee881c374f315141f6e5042f7828655/luriwagej.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609557ef93512---84772711297.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/13193285173.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9d6c6bb9d4ed2eed71689a7cc4904a54/27765739275.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kibirak.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/kidudew.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2afca3df4---38796814536.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/9940376774.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/86342421660.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/73981934405.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9ko2915ir2gh081dg52dtj2mu4/81756511385.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/musurivurivakorevekuni.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/gosulajokup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=shortcut+key+of+copy+and+paste+in+computerPDF 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_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 17304 bytes
SHA-256: 4b10be1eb52ca613a885819893eaa4a4c5dbb0a3397d0ecca680728d228080e4
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 11220 bytes
SHA-256: 071ee46f209c9b3528b923c2d8220ab77c6f4a4bde77c5524382a47f2b9c00cf

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