Malicious PDF — malware analysis report

Static analysis result for SHA-256 289e49826af13f3e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 16:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5417d73ef03c0b30e37f85a66c975a6 SHA-1: 16f492bac0c92f879d62b9b7526d8d3b45aec30e SHA-256: 289e49826af13f3eeacaca0dc030cc8618a1861e0412f4049308e82e7052fd43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software via the link farm. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=prime+video+apk+mod+download PDF link annotation
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ab0e899f---nunozurofejum.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76233222061.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791c1ef737---bumijixunudi.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/zufamugedupetiwafaga.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/64088535228.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/67486439356.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/50620812c8a5b97329e2dfcd812626b7/13690909355.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109100431281803.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/8266155877.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136460ddf8ca---50564308727.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138385bb3d10---wofipujuzasuramojixevugo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef936c1e0f---16880469870.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/famoliga.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_257FF424CC21AAC2.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/87411653062.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e46b3c0b---64952143226.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/df3s1pvgq4ib8g13s9s6n93s85/66864146291.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613081081705c---26646698237.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/poxolewava.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/6557340161.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/22798296871.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/debikilizorimixaxifababil.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/regulop.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/83617649026.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/dowegopipewibovazagugir.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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 18180 bytes
SHA-256: a60f7339f3105fa7effd8bd445e32d090e23d0d1e952fb86d92dcc9810769de1
font_01_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 10532 bytes
SHA-256: 8531d91603f2871f4ffdd9a71f4907e35d19d36121e26f38cf26c628f1a587b2

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