Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa02ecc914f51b9…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 03:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b4086bdc2628df56ead627a9fe2b8c7 SHA-1: f02bbdf7d9a314afa3a0e06c7a1fa151eda1fd14 SHA-256: 6aa02ecc914f51b9ea55bb015d23c626decfa4b391e697b22c733834357e752e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://physocare.com/Images_upload/files/runim.pdf In PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/16192524066.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/bujederazejuxep.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3d3125d96cd1a795252c0f9724e0df1f/65232448425.pdfIn PDF document text
    • http://kasargod.net/uploads/file/29840679602.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609666e4e97b6---88852473808.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/vuzine.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/kimejutomorexenamed.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/84239591573.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/zapolip.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xugotutaredidedukafajo.pdfIn PDF document text
    • http://charivne.info/images/file/widawovuvowu.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/rilusu.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/nexitijala.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f3e504180fc71ca5d921e9ff0b87eb3b/17488902147.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/zodafujoruj.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/xutagodub.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/26596866556.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/medeziragolurepaj.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2oh2kt75idmpkeldrja3liuoj0/gabezevifigozuxinile.pdfIn PDF document text
    • http://novichiha.ru/pic/file/fiwazufasuwuxamo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9ufekdf68f2hb9n0rjsab1s234/48367114233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=laravel+homestead+manual+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 22800 bytes
SHA-256: a200566a11a1ba2c3945ba59e7938d3c05f2108847c759239fc6d0bc0f683611
font_01_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off00013373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8A 10628 bytes
SHA-256: c1ca210026b34729ad10a34226f559f48a2470e7e6f31965cdc74113ed36e3f4