Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af85daf0b4a39fb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 09:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 107b7d8c0b92ab9c0e21d6f83d169d36 SHA-1: 70c82430043499ffbbaf1d529f1a2387746f53fb SHA-256: 5af85daf0b4a39fbe0cf7ca480b17b212cee63b49e4ca8c44a5ce5e591866d7f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://deleersnijder-bocaege.be/images/file/62772509816.pdf In PDF document text
    • http://marinda.ru/pics/images/file/goxedunajinepala.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56489154880.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1b800cb5---49548003071.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/12715581638.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xajokurifoxiwagur.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/didobonadovemagosixutugu.pdfIn PDF document text
    • http://terrietanaka.com/library/files/33862554236.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/zosudigixukaxe.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/45736967401.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/6026259577.pdfIn PDF document text
    • http://ruresept.ru/files/file/48887404306.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qavc71645kd14qithbpg0328qr/52019138498.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/75038968378.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/33340335108.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/ralojepulazo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/talovimade.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130be31b8060---jajulexikew.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/17710392484.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/bemepiwowun.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-13/210913235043987787vzgpofhdledu.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/95764465005.pdfIn PDF document text
    • http://midospa.com/upload/files/zaduxujudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+wit+and+wisdom+of+mark+twain+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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 18316 bytes
SHA-256: 0349ca8873c0dc9015ff9823f2c7bd23b34f6902b411915701dc4b34ab1b2608
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 10860 bytes
SHA-256: 1ca50fd44002fbe9c63008912a554fcbdb4488f86ae721a85e5a97fc731df40b