Malicious PDF — malware analysis report

Static analysis result for SHA-256 489dca9337fcd907…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 02:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ef7f65c5fe55868c0f05a3b84a35902 SHA-1: 58d7250a779367739984d43f1204764946683b2c SHA-256: 489dca9337fcd907adfd3a694d740ad221b8a8a130f8e01063ec80dfdb329841
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tatagz.com/uploadfile/files/73080326688.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/58kc2i3obdab10jpf0toltj1o6/24891220246.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc72067d4---pofakuse.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e03655c46e57b093df7e4bdd191e21e2/31568451565.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/wejaxobeno.pdfIn PDF document text
    • https://securitydm.com/slicice/file/93623343348.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5416d8c2c8---51006333518.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/2130738768.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xijegaditefizirinamu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160effde8cafa7---gubesenoxunegup.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a17b0ee2.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/36126186070.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/digozub.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7abe5a85a---71049752629.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/62592311213.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9245c2e3bc---sapewadopiwojalifixazune.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/fewon.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/90465059786.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/75889611727.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/49c01a232660d092c532413cb136a6f8/tiwixitisufigumupenikaw.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/909f6a6bc0fa657405690371d9a8d8df/46945946474.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/60471259422.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d50c622c---6998935596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+cry+baby+full+moviePDF 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_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 17596 bytes
SHA-256: a8bc317a8680d05d514ca1f4c666c93042842ab7a56b1283ac446b2cfb2f81be
font_02_sfnt_off00014650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14650 10744 bytes
SHA-256: 270a2da6e45d8d66bb74eb0b901356809f55f140014caf2b0086555ea06e0af6

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