Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc24ef1696d3bc20…

MALICIOUS

PDF

105.9 KB Created: 2021-05-16 14:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f23e19c0b203462683c0268b5f79855f SHA-1: cf33783066e5ad4b6bd9c5f1751a70303f6dd5e2 SHA-256: cc24ef1696d3bc20aefd4a68ab53ef71af1fec67b6bcf5aed1c084ab770fbab6
196 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to compromised CMS uploads or disposable domains, indicating a likely phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q4i2dmrj8g4db3raea7edef8nl/fuvibegakobibuxupimun.pdf In PDF document text
    • http://angelescare.com/userfiles/file/37722437632.pdfIn PDF document text
    • https://activepymes.com/pub/file/kukegixiwesuwavofot.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/34bc77a4a7f213feedc9022ba397dc6d/tawuneverugatuwabebev.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b9fcfbfbabb9f6edc71d93c26561542/vibifa.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/96092391622.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d54378d54cd7a6de4cdcd61f3ad91951/kenurusavusugedimen.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92e966bb4---juwelajaturafodinabiw.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8b9b2c31---42281862236.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f28b4b041e7dabf79c438fbc8e13ee87/jezizuka.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/86f71cd65e447f46ffa3213c8befcb44/sutejanotizitivipopavigu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/b37fdnqvo0ui6l83csphfats7h/mufowawuzokamizisoluraj.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/83285568312.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607527cae817a---zejinetada.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/s5gsuqd6k0fciid8o4odv64055/17321366400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rpg+android+2019+offlinePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 5160 bytes
SHA-256: e4172a13dad989ae2f26ec1bc442fa1cebafa7fd0a93b726bb8446a8611dcfd4
font_01_sfnt_off00013500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13500 5520 bytes
SHA-256: 2dc3f1b77fa8f718ce50c38f75cf8bf864b6dd72df525e3dc3ae1c839a008dc9
font_02_sfnt_off000147e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E1 22968 bytes
SHA-256: 0c1f9ee6183c79306fd74c5d96d59e10eb39e2b68a354480e4296e0b5dbdf85e
font_03_sfnt_off00018100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18100 16672 bytes
SHA-256: e8ead77fb1799a36f04cc133ddbcdad09abfbec14b6c0ac9a80406f0b6003194

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