Malicious PDF — malware analysis report

Static analysis result for SHA-256 a757519459b960b9…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 13:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 808461082d5c2f089f325af06311f79c SHA-1: d5c8d742a1613b9ea2d282f9cb63f71a406abeb2 SHA-256: a757519459b960b912e267ba067c1881f358db39c973ac85628deddf4dea6831
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/qn9d8n7q1ldsuqp38q74ljrigc/4758255991.pdf
    • http://zartmobilia.com/userfiles/file/20210807062240.pdf
    • https://cgeminfos.ma/upload/file/83857710319.pdf
    • https://atcotourismtravel.com/userfiles/file/natoluregabumakafanekovuj.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b38bc4ed10937d34ab65e28377365e08/24732322451.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f78f87789---pigevafimipo.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/fibulatimaterojit.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ea3dc4714---64716104771.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a383502f5---16985969116.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/b9b84bb1a75f9f5e42a5315ef693eb90/20541375876.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2fd04055---wipajonapu.pdf
    • http://mynigaoe.com/upload/file/20210630035605.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0a7mp2mbrl8spsi6pk47p5nc1b/8017025289.pdf
    • http://studiomontironi.eu/userfiles/files/tegetegogajukej.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad251ab0a8---37042998037.pdf
    • http://a9188.com/upload_files/art_files/files/20210704_064728.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/42008707503.pdf
    • http://thietbiotoviet.com/Images_upload/files/55002456137.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/49647042693.pdf
    • http://unite-chem.cn/upload/files/26950319890.pdf
    • http://augsburger-dartliga.de/uploads/file/zobibolatotulo.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/57351131258.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3c0f488cac2d72d2c582f9287cfd227b/88382500469.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/18213183345.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fexufoxebavudunedipi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cat%C3%A1logo+hinode+pdf+ciclo+2+2019
    • 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_off0000c922.bin
4ccbcee4691390954a6e78139fabbfcc7828bc7c36860b2be96c8f5fd90bfb52
pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 11304 bytes
font_01_sfnt_off0000e31d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 16792 bytes
font_02_sfnt_off0000fb2f.bin
3372b31c80d874a11eb03279438ff254d095103c8e602aeeed8e65fa55850597
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 17076 bytes