Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff25098f7cab9df…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 15:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 619ade7ac08b024260f7d11d20f608ef SHA-1: 9c4308b17e4129338cca220bd77caa6d201bccaa SHA-256: 1ff25098f7cab9dfdc13b21d24496c9004dca026d2cb2bc0b643816ecbb89fed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xumupazujigapujugulojoxi.pdf
    • http://immobilieninvestors.eu/userfiles/file/32064707903.pdf
    • http://pm-ural.com/uploads/files/tibededogopusivofa.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135bebf604ac---raxagufubimaxolepax.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f601c4f102---fejazigufobimedugig.pdf
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/monixosove.pdf
    • https://hoongnau.com/upload/files/rowazegesu.pdf
    • http://jr-bang.com/uploadfiles/20210907131825.pdf
    • https://damiel.eu/userfiles/file/62884069264.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f55c2792e20c8fef15ce88a448f072f7/fiwujifixopifeg.pdf
    • http://sofupingame.com/calisma2/files/uploads/vetafatefawukiwidepesufo.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/19791446251.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/93275271192.pdf
    • https://micro-logic.ro/images/uploaded/file/mabitekegizin.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/56c3ohkd9sdd89ekrg1p66j31e/91416787292.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/wogutapivivu.pdf
    • http://immobilieninvestors.de/userfiles/file/22095294947.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5fe298387---24368143820.pdf
    • http://thienlongadv.com/upload/files/nimox.pdf
    • https://zippy-inc.com/app/webroot/userfiles/files/74081268325.pdf
    • http://novafish.it/userfiles/files/siwuxodo.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132317f8caa6---fisupareg.pdf
    • https://tepatsasaran.com/contents/files/desojef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=retouch+me+apk
    • 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_off0000e405.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16792 bytes
font_01_sfnt_off0000fc1c.bin
ec33cb5c40f958bbd89ce133a42c0eba48f4583c429d92618c5ce1e747818ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10364 bytes
font_02_sfnt_off00011398.bin
31837a67d3c5a6600134616b891fed695aa1295c65175ca4509579fb39e0d85e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 19712 bytes