Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe50b5d1a1698e0…

MALICIOUS

PDF

84.0 KB Created: 2021-08-23 11:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac59762cbbd4d3fd5146a8e06a5b650b SHA-1: d6cba705e544c5f4aec57567b8bcf6e476379486 SHA-256: efe50b5d1a1698e0bd05432bc0441bbaa59e6721b72ff4426bf8fe568fcaea6e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aitrans.org/UploadFile/file/F1202107031942186763.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/o962oh4ebs1nbqukeeeec1fhl7/65858636316.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/makojabamapesamot.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610075240fb9d---vadafofokes.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa70213610---zemexomeji.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/tunipufuxijizul.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c08216c238d---zobunepozodifigotaru.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c330af35e57c847ef346dba6397ba9b2/femosavonu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f785e285b2e---67872350913.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/pajiwinebanafokara.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca59d56b62---jidasidujelokurezewujon.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/62542683889.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/bolazafibilidu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zevosudexuxutiruruzibos.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/64625987040.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/29f336eb80e8900f76cd64ca75aec5c2/84039737181.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dki20ftklt64mihs280gnmaeaa/30384338215.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/karilewenugadezatuzoxeg.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/84785919773.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097b160d9e26---9222660751.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tutusukapox.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/63931979751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=day+in+the+life+of+an+emtPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 10328 bytes
SHA-256: cfaba6d746ceaa523b325f12affd85d5b0cc40b6a3b4fd097a4813c3599f5ba4
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 16840 bytes
SHA-256: f9f02a855093f3edae7ee3acd6ddb7b77a88ce6e905cee9462226822f9462b85

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