Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc070791e5ec8cb0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 17:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 503df85c64da89dc5b89fd9e0652ab63 SHA-1: ae25e1ed345ff393b3653f228d53c1f2fdd06982 SHA-256: fc070791e5ec8cb03106499fb795c9eaae668afd891a1439e69195294901d449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=home+design+apk+full+version PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf995a0199---minulaw.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/79663284612.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/bonipisamudofo.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/panakusipefikavalib.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/zojutoparekokunoxufovis.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/91648498340.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/28054452934.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/nabojojofama.pdfIn PDF document text
    • http://skene.es/userfiles/file/kuxisopupetuxu.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/jubusujodilujizuxetemafek.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7aefafb442572cbfa48674dec0aa190f/nerekuturomafijigopubi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22dc19e88---75629914235.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/darifuxelagexu.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/mureximamovas.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149a419164ee---38400408939.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/fujotemim.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/putufuparorobedavukazeji.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630759740.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/41522965528.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/77634682832.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/matubezeridanavorumududi.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/100424176.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/41987868279.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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 10992 bytes
SHA-256: b1625a589716798211aba2197ab9086f4dfb819e98533ebd5814c7c23a5179eb
font_01_sfnt_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16144 bytes
SHA-256: c22d8c4fc18ec224cb08ec57304f4fa5f79da0a2ac32c156ff3822b3a08cba6f