Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c046253ee3f667…

MALICIOUS

PDF

93.9 KB Created: 2021-07-22 04:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39b4ac6d4534b69c23f62150ae4a8b7f SHA-1: 5c0715d728621c0286b102ffa966058d0d3634d3 SHA-256: 11c046253ee3f6679c9721ad21ea377817c3e4c72d249fd68fc80dd37413fa4e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to PDFs hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7835db7f2e---tamapunamukito.pdf In PDF document text
    • https://turismoporsantander.com/aym_image/files/88906623587.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c855823c9e3.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/72469209603.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3jribj91ircvjoe7u86hm6c6q4/37674963850.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/l9lsnu7g9msn8c2uf0evlm8nqc/redilewe.pdfIn PDF document text
    • https://schmitz.cz/res/file/filepugezegasarodis.pdfIn PDF document text
    • http://soupworld.de/upload/file/dorakepelexibiduzavotefod.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac4a7f3d2---38623770115.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jotesirizajoxuzegazonow.pdfIn PDF document text
    • http://chikatere.com/Upload/files/60275822897.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b95ec08a641044b904cf3ad73c840cf5/pafabedimawurafuxupa.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/42271839443.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9fb816bfa15003b93640f352af530a2b/22566330168.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/xujixe.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/70fs89h7603dpeqb1duvqbj8kv/zonujovu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a4538c4b5957a6faa1ccc4e74b961d8a/tipejukam.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/varafunese.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4d885f5c6e644f3f00ccfcdbff1eced9/91679205784.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affb4df86e---watojijawinukoxafup.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/64690796014.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/36399496307.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xakuxowovasowo.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tujezomuvovi.pdfIn PDF document text
    • https://comiconfezioni.it/file/gazokenepigoripob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=butterfly+telescope+goldfish+for+sale+near+mePDF 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_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 17072 bytes
SHA-256: 95a5400a07f46050c391355b4096e15ac3a6864151a0688aafa369eb78e91186
font_01_sfnt_off0001376c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 11332 bytes
SHA-256: 897aa4e00f9bf6a8e11e65c6f0bd06f430710e2262295e30c19e26b9eea900b4
font_02_sfnt_off000151c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1