Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdaf80604ebd0a5…

MALICIOUS

PDF

91.1 KB Created: 2021-07-22 07:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a3ed14782d308ba63a65de713412a32 SHA-1: b0a42c937bd7ad88d354d076b7b24d0e3760f932 SHA-256: dfdaf80604ebd0a53b0c50b301885a7d9810aa400aa765cca34862db1da9b617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a potential phishing or trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. This suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d170ce2da210ca31ef4382496096522b/rotovupuzu.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a53d8a95d---bowevapozu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/90533657760.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/18ac929fd9f579176eccc0d7ff1f7587/44547638644.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/u44jtd1ehu5k4b4j9b72rb31g6/32770852706.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079dd4270c00---20536536432.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/zirudexipoxubafojubesori.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c2427ffc96fd7a7d876dc3aeba253664/sovafukajida.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/leverudug.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tonabiv.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609695e13e7d5---29167976884.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/raxiw.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf905cb7e---83755719610.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/b37fdnqvo0ui6l83csphfats7h/mufowawuzokamizisoluraj.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/56138758538.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0685f0da15---66332234121.pdfIn PDF document text
    • http://dzbnf.com/upload/file///gazumez.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/soxesigeri.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/30280345663.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/90833667044.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074f6e6e2733---99217197092.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/kemixivifogewasedizu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f6090a5c40612a38f374b6d4f6112939/sumupaxerabalefojusugoru.pdfIn PDF document text
    • http://dgjst.com/upfile/file/37941116092.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0a8f2d7a30d395f4a7924084e6a384df/wapesuxosirize.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079601094711---gidemulobusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=topology+questions+and+answers+pdfPDF 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_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 11084 bytes
SHA-256: f33f9c435234abd76f83c53811607891e8b2600dc7df33ef33fc281dd80bd2b3
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 19144 bytes
SHA-256: 6bf2014e21ade2b50598ce12bcb03f0b1416c4a44dd3696c1eeb03c240db9c62