Malicious PDF — malware analysis report

Static analysis result for SHA-256 872acfdac33c225d…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 09:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 99a5c1fdfafe171ec7f4f83102530ed7 SHA-1: f5a4c5bd540f696a6c096c038be68c39337173fa SHA-256: 872acfdac33c225d6499d86456fa729ed5d3daf13d7ce4ddeeaa9361b7ada542
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure as a link farm on disposable hosting further supports this, aiming to obscure the ultimate destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=all+pho+you PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nq3mmkrjsv3ra1th35900kcmp3/74384966651.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa09ef4040---91669616369.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771953750b2---zipamomabiwemalujunotewa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160abe29db1fed---7034324289.pdfPDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cuqt79piiqe651ed92mrjv4f4q/26028229492.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/mazanetajodelabofekiluw.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/77572146345.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/robawaxasoxobawunubapo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d2be41cda9e---nuvesifakoz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b14047e20d---61255925912.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f56eb636237ee47d14cb466e26bd35e4/22459586288.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/35403774377.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c275c0c1cc---40548084117.pdfIn PDF document text
    • http://wych123.com/upload/files/gejunupajuruzagokez.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/piwesokozatutadarelis.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c27a433db43---nadipemefopazaf.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/333620434.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed1578e9f---fulodivawozasuxemarawif.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pejewomijupibuvosirekew.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d289c0c2d5b---3669446085.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8b82921b---89563013896.pdfIn PDF document text
    • https://avvocatoboretti.it/file/52748784559.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/49091355142.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/linuwovakexibapubovit.pdfIn PDF document text
    • 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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 23896 bytes
SHA-256: cc5ce583174d6188dc5ac0444b8085206e71b0630fdf784e3564dd5bd9fb2d73
font_02_sfnt_off00014809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14809 9688 bytes
SHA-256: 3a0a9626ef4f29575f6d5d20656efd8849ebbbc05514c61bb05a3c61cc5223ec