Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7ef3901a1e3323…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 10:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49a4a29a60d764b4c71330b8ab420703 SHA-1: d0798fd51db487dc3d52b3a9e9f777c8e505812d SHA-256: 0f7ef3901a1e33233e0c73315b42116471c43b7baa8ae57613e52b1da126c08d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics confirms the nature of the document as a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://elementsgogreen.com/userfiles/file/sobupuwenodarufijibene.pdf In PDF document text
    • http://carrozzeriabosini.net/userfiles/files/27275575835.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946faf2d146---99136034604.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/15002489129.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/jodikura.pdfIn PDF document text
    • https://soltendance.com/stockages/files/fosimunegipuwawejupupesem.pdfIn PDF document text
    • http://ihdbd.org/upload/files/wuraresanatewifa.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/6f3ee47bd85554ee84056419023ece98/4096762900.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/54798917016.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c1a98a9b3---lenezulekikezojapumepu.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/zevusumej.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/90798083067.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8cf02f2fc2e6de61f6cef35e23df2be6/xefupunazun.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c792de8e9c---3503621581.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/96ln245n0fouvupo8bq8ilp903/56503021869.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/tapali.pdfIn PDF document text
    • https://yellowstonewildlife.com/41520347067.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/10876646666.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/kinidejomawosote.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wisujiralamoxip.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/sosukipaxivadutakelat.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zazizozojibidepa.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090074129801---82152545396.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/39074984880.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/96675121174.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/xabok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pu+cet+pg+question+papers+pdfPDF 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_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 18324 bytes
SHA-256: 8b173c33de077d418dc0e580392e5492a8e017fa1644fcf1c8fd58af539d3846
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 10996 bytes
SHA-256: 29eb218b5d7a4d355468157d5287fc5c0f82628a1c6e4104bbc8a79d43837d91
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1