Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5060b7efc047ba…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 00:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78451efda93d14a5bc5f08685b0f8206 SHA-1: 559037c17a93ecfa7fef78ae4662a81aea3beb54 SHA-256: 8c5060b7efc047ba3724cb699ec10bb9716fd774a939dd1a8165d7aeebf0b529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and EMBEDDED_URL heuristics indicates that the document is designed to redirect users to external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=live+wallpaper+on+macbook+air PDF link annotation
    • http://www.physedu.in/newsite/userfiles/files/40526668999.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f33028338---73279793082.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145950da3562---42339047969.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/44197454505.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/56112522001.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/kanobowajinefem.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/fabuxokebudanijavunovivet.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/65554751663.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/23623444716.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/72021751122.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/10708531470.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/lelowuvu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4de11fcc197d1714e467d4071cf5931d/4358683232.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tedelufiwojinofanusevus.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/xuxikiz.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/xebitavus.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/dabeduje.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/dorigatixa.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/wenuvulutaxonuvujovux.pdfIn PDF document text
    • http://tzsunup.com/upload/jinovuzemogufosuwulipesus.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/kunonefukefasijipezem.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/10796640004.pdfIn PDF document text
    • http://standdominica.org/files/files/28973940492.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/10509487968.pdfIn PDF document text
    • 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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 18592 bytes
SHA-256: 239f027bc417bdb57ea4b24458ec21e0e2c5eef1e285ad9cea175acec4c8a395
font_02_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 10608 bytes
SHA-256: 96446054bec1a817e9ff9d6cedd312ba3513b7817f6fc8121183dfa3f847e4d0

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