Malicious PDF — malware analysis report

Static analysis result for SHA-256 607cd4ee2c5b0eb6…

MALICIOUS

PDF

114.9 KB Created: 2021-08-11 12:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c538b355b6946e5584fb14a93086c5f SHA-1: 1601c647e28285dfbd0b670caeaba7b5551a8782 SHA-256: 607cd4ee2c5b0eb610c41c50b7a11dfd0a905e33db27ea853a56eb8abfd8e7b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://verduciautodemolizioni.it/userfiles/file/lukigodetukop.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/41453944244.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/xejubevoj.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82894976220.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/92104593659.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/nikavezumumigidajaji.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2722d212c---24508187430.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/20fb015d4597578cfb152a1532ea27be/24155092213.pdfIn PDF document text
    • https://superchills.com/userfiles/file/97843539228.pdfIn PDF document text
    • https://dineflon.com//files/76499197449.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/namub.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600b57c01e---48758059831.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/83324839783.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd192205d81---12202081698.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/65238666879.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/25c74c24144227de3990b409ab2e4535/kafaloz.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///89899808551.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9579f31771---30309846862.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9d82b472f---75848519166.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1dcce9e6aa7b016ebbc24cb1c841ce1c/dazuxuboriguse.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9a7720fb---mekazurilege.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df7bcd1e942---modinurovolop.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vutexeramo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607961a777f78---44481408819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+interpret+barthel+index+scorePDF 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_off00015a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1F 19236 bytes
SHA-256: 14e11510746e5ce0e2f8802c5aa9e7af5b4717b953a46ccff5d62ba98d79fe59
font_01_sfnt_off00018c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A479 10928 bytes
SHA-256: 14733b0f7740841cac6e0d571ba44186bebe23b01d74f72155dacc829aaa0289

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