Malicious PDF — malware analysis report

Static analysis result for SHA-256 e001609a8f42d1c2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 18:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 757e466664e99c561dcd334ca7aa7b78 SHA-1: 3269bd3864731a26c7b3183990f2ec6b11cb323f SHA-256: e001609a8f42d1c2d432c7b28544c372bc9454d0c4bed1f39fe8244c69fb0648
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous unknown URLs associated with form upload plugins suggests a coordinated effort to host malicious content.

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132671992589---zejotofoziwu.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/30368785814.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8dc50d6de3f09ba9dea96a27acbd3069/wuraronivewosuzufedok.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613443206d778---vufixalefosolifapewug.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/52942884228.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/60643046872.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/71477167386.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/basetezolopamitomovizum.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/kukodiwovof.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/47698159707.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/lobowananurazafo.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/fulibojakutebosiju.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/kofemanevabipitotuj.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/37733541686.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/xurofetusiwivaxoraxowafem.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8631218450.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/sowupolik.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109121958276732.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/49700703272.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kurovetaduke.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/36249508998.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/20654589260.pdfIn PDF document text
    • http://ledins.lv/cms/file/64969294098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=block+ads+in+chrome+mobilePDF 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_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 18092 bytes
SHA-256: 1b71950ffae71fb023739505b6a1c9a158396b625ead65f63ce718d84100adae
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10820 bytes
SHA-256: fd21695ce270b8835aa5442f00571e60f993927834de9106020b1ab4396097f9