Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41da9f7cd0d8845…

MALICIOUS

PDF

104.0 KB Created: 2021-06-26 12:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5bd958e07b0872a800f53cb978ca437 SHA-1: aa70d1980bc175e79cd68e5ca23a4a604fdc95cd SHA-256: b41da9f7cd0d884502a077de96c3bebf86c300a3c0c9f43074e5cfa76cf7d8ce
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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 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://pistant.ru/uplcv?utm_term=jaw+hinge+joint
    • http://kochamsushi.pl/UserFiles/file/19361224240.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a460b031180---13824825443.pdf
    • http://vimar.ua/userfiles/files/66391286825.pdf
    • http://adaviestransportltd.com/userfiles/file/xijemadomipuxosinew.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8111e98edcb2df33032547f7232940d2/59604066921.pdf
    • https://doktor-ara.com/userfiles/files/gupivagat.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h2lr46lkicdo54gvrunf50fnpd/20330360750.pdf
    • http://ahchala.com/img/file/47559764893.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f9eadd30ff9e4a2d893a9550062c7396/18308216217.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6619600de4---76021272700.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160734dfc23b09---bezulozuzajibin.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed94d7acc---20602265806.pdf
    • https://alakharia.com/public_html/userfiles/file/88064940318.pdf
    • http://feach.ie/images/uploads/file/pinejakozupavevoto.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bb56123b---fapitipegunujawewina.pdf
    • https://cardion.dk/gfx/fckimages/file/32894843971.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/726f37aa6459b5d88d470fb2eb4d8078/sojijufiragarupikari.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48609f4a1---dakunesetutoza.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9l8ard9vvai8729jq3mle3tb69/repolavelulapiku.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7aa81011---sowatuvuseb.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca58392dbc---56524395295.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a22fcaade---35647190882.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/63083274896.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/810100f4e5bf8c1a1d4a41c29910c7a9/zavefukize.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013367.bin
d482cfc5cd7f530881bbd1fc4ea47dad8959efd4ef982df80cbaab5c4439d04a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13367 10280 bytes
font_01_sfnt_off00014a86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A86 16792 bytes
font_02_sfnt_off00016298.bin
c345cce7197b3fd74a9ee98af0070caa2d47305a12c1b57aee788143c762d963
pdf-font-stream PDF embedded font (sfnt) at offset 0x16298 18800 bytes