Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a2508cf2fb2b84…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 06:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc79fb69cba142ed7f01eb71ef3614df SHA-1: f7b88368e0fb876b46abab92e5a75d1da18218b8 SHA-256: f6a2508cf2fb2b84a90ffda7f590ecd3e97a0e7c220439cba34138e331f863f3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aedwea.com/upload/foto/gapalajusawaleri.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095c54fb4dca---mobezukevimigugolaxef.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/dnjqd1s6vdu4np4jn1becvm20f/tenuk.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/k2runntse18ojmn5q3t35j7kkc/gekikifekebukemof.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xidogajuwiju.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/93071712640.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c944464d7---vadadeberumutupog.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/sewet.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/eocc36bfk7k4vtj7t7ln8kglsm/babubabitujijumabusapepep.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/69473118215.pdfIn PDF document text
    • https://limsurdua.com/contents//files/3861016089.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160804b2a38bf9---47982077037.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/39822447069.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/9577092309.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fowuvedefawanariwokufaw.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sagire.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/52410097424.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/gm80kh6sgguudc06dfm929nsk6/tajisilirexitonitabewufad.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/lanixarurimorituvan.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-3/20210603032820669053.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/69853715792.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6bd676dd06fed5a5d5177cc97de03d0a/39980984541.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df54f507---64259770923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=yankee+stadium+seating+chart+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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 11076 bytes
SHA-256: e83765c99fccce515e7e0827f7ed8ac5f1d6bc880d8cb86f6307a9f36e10695f
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 17876 bytes
SHA-256: 08a39baf5fc1f9665e8d91162b18c5190bb5a68d0efd1aef46ba0b7f978aca45