Malicious PDF — malware analysis report

Static analysis result for SHA-256 122880c7dd2bd0af…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 05:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ef077e5ce8f66315595e932129e8f24 SHA-1: ffd57236218bfce8ca37bf623d8bfc7ba939909c SHA-256: 122880c7dd2bd0afbfe7be1dfcb2e24db2956e278e75b56f8c74216a8f4e0ace
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3df640c52---9084208666.pdf In PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/20747256315.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/lewabovixezamenobezi.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/17396187954.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da62747881---rojukuvukoxuwagijeritigeb.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329bf414fd9---39868843680.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepob.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/morikejirubu.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/gabavutipejimadoruzujilaj.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/45fb792c740b38eec52c9be867a59b24/7906210108.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/nokujoj.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ri5544kmg7fs95af5c2tki23sa/kewiv.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/5189559351.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160cae8f82d07d---26256197673.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ed6d72b1ed2ac935544694f631c4cd7f/xeramodafunexoboraxaw.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d76259993---48048295301.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/49422476072.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/79007105003.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-14/20210714065335402620.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/50915713680.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/42053143339.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/dujupar.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160db95d50fe5c---bapimisaxal.pdfIn PDF document text
    • http://foodchemsino.com/d/files/37883172494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+signal-man+charles+dickens+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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 16556 bytes
SHA-256: 5a6e0d20998da1a7bdd590cf37b0abc4ab073af203349f8be7f60c800b3655a4
font_02_sfnt_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 10936 bytes
SHA-256: ba4b4cf549ddb03dc3e704e591b0ed101207667c787eaa1333d903c9b6ceb86c