Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d3ed86a789f4d1…

MALICIOUS

PDF

87.0 KB Created: 2021-07-14 03:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d28550a8356b63cc23a1e2c01b4892e8 SHA-1: d1c0e5ff4cd19eefb9685b22513e823c7fcc0bb9 SHA-256: 43d3ed86a789f4d17c10b31da25ae5b44520aa1031430672523c69b34eef651e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress upload directories, suggesting it is used to host or distribute malicious content. The presence of these links indicates a likely attempt to lure users to malicious sites or download further malware, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e149e4eaf3cf14b0c3d7b4ab1fb760c3/wapebivozoligadurogubogak.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d899defc---wozewi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec0dacf8e5c02b35ab433f85a3358e1b/bobirolubo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/44652847675.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gagagunekonizetarise.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/nurarela.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/98591570351.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b07c177b7---sekatupediforejidakosidat.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/23283552105.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68033156e28d3fa91bef40879c18890a/fiwowikabevapuve.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c909303abe4---76705651649.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/28962146585.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/81406850772.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/81503018489.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/62139271247.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/83260950987.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c41d72754c---morodojasu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/o038b8kt3tuuhvm7b7t6aobgl5/bisezuwarofo.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/39157866462.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79b867c91---lazow.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/70226059656.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/80027388727.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q3ih6onten2potc5f0jlps8imm/patisilenuvulin.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1cgfq4frug1oa7k6umrtplgjrm/88936498194.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f00532897---46788297911.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/59275771977.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/pulimakegot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+dates+of+the+classical+period+arePDF 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_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 10576 bytes
SHA-256: 0c48997250617b11c607418a9f91fa79bc4e3dcfeacabf466c281558b9a3c9d0
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 16388 bytes
SHA-256: 760c11e37dcc4bd95a55696c18a4b2638203039c4ebb89b32c39458559918aa7