Malicious PDF — malware analysis report

Static analysis result for SHA-256 84518e8a671b020b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 08:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0a75afc05060367aa6fa36b09196434c SHA-1: ac6dc534d650598bbf85f203928d8ccef0b7f1de SHA-256: 84518e8a671b020bc9ffd123f0d3049f5bb162020340362d1db2b2f02e32751b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body was heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/dg7uniibal5tel5q9vs4dv5p90/kifoxuzabukomotapitame.pdf In PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/012ediidkf5oel3pci9ondfped/68607447572.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5d88d7b7b6ddde783755c8823f1142c1/38765007203.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/dosakutaba.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f078fdf2---12624733020.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/vaxupiruw.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/65385156383.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/12691350854.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/rigipamu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/00b10a31308f7c496cd40529fc8bc22d/95250956917.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8ad870bc4fb5ab0e7cb681e9b7e047b4/linifukamogoxezumek.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/xobomiwixovirowawirup.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/pedesirudekirogupu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/55799350513.pdfIn PDF document text
    • http://cx-gl.hu/images/files/mesubawuvet.pdfIn PDF document text
    • http://kaies.cn/upfiles/210802083537301180yts76d.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zugeretimewuguzelekugu.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/63669739058.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a919ee95961---38538178266.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/kikunanunovosemarebu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08a065db8---48980852971.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2390ba04c223a65bdf3962cceacbd9ae/35299319701.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/62819655300.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116e32294864---pepifumidofimiwukudezu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/9mmiuj6uqb7qbolv4d0qijqrnq/50093700824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=beetlejuice+tv+show+streamingPDF 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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 18436 bytes
SHA-256: a93bfba95626bc5f5cf56ba4cc5e50bec7636236f1220f7517a1828052810731
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 11112 bytes
SHA-256: 26f1fb91fdfb96c08e7d648ade251084640b30d2beb73d0a95e43e180c49a0fa

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