Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ba12dbcd0373d0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 23:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49223d8704ef0bc1f3bc1df6275d269e SHA-1: d64e5f4b77092f3923cd6678cebfdeb210a1c10b SHA-256: 66ba12dbcd0373d03d8811ac87063225aa05a7d0dc3ac99390dc0eff83595dbf
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 websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://grancanariacomercio.com/documentos/file/20394281549.pdf In PDF document text
    • http://1000projects.ru/upload_picture/file/gebikewupufonu.pdfIn PDF document text
    • http://sbairs.com/datas/files/70952930339.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/29327844753.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/tomutitoto.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/49213591535.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161413c3f61c5e---67954999669.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/wikajipit.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5420c00b1a10976f4c040299d8433a22/giwekis.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/xivopo.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/xitenadivi.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/mimozogilik.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/78581403882.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/rujonexadazegonuwubowibu.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/punezabimununezetig.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/29308109632.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/15725775427.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/70919991142.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e0292dbd940b867f50fed7e5589d9caa/51072004153.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/mogikivafudefi.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021941410211014.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/12816371072.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/pakipijipatozijufatume.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/20422118669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+san+andreas+cheat+menu+download+for+pcPDF 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 17908 bytes
SHA-256: 88b987536d6534fa43e2db183b60b7ec01f03cbb9b5500217cd549eec42d62d7
font_01_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 11016 bytes
SHA-256: d162779322215b9e5d6377ff3e31d1dd3fc3ec094bce32e8eb79b704083d5c17
font_02_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1