Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ee0f06bac94973…

MALICIOUS

PDF

76.6 KB Created: 2021-08-04 22:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 228e7be6d8aa3469765370d8ec002c27 SHA-1: 3f920917419730adf291bc092fa583b0bf256f06 SHA-256: e3ee0f06bac949731a1494bfd26006bb448c02e7fa41383362f956e43dead69f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, likely to lure users into downloading further malicious content or visiting phishing pages. The PDF structure itself is also noted for containing duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f9cf7611a65ada7ddc9d4770c41b1c24/wubafesoravale.pdf
    • http://myphamnanyno.com/luutru/files/xunimi.pdf
    • https://alatheir.com/atheirwsfiles/file/xazevavepomodiwitikitori.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/go22g0d2rp3sv5l72q5r8lcs93/31848760712.pdf
    • http://vo23.ru/upload/file/bimejegiw.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8a487801a87ef9994a7782222550bb58/rededovajefepusamup.pdf
    • http://polyalpan.hu/_user/file/pesapumufisovomemaxaxebaz.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d332b52e46a08f1956252248acbff408/18227461910.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29f3f1ef4---44578619500.pdf
    • http://mikailang.net/userfiles/file/20210518235134_99231057.pdf
    • https://benqmusicworkshop.com/fupload/file/43272948725.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/23400141693.pdf
    • https://autotrans911.com/thread/admin/uploads/file/28643600725.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kn4bscm5p2ree3krgutrfgfvng/janabavipipaxowunate.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/dezaba.pdf
    • http://allamericannursing.com/userfiles/file/xefewakigegugivedixed.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/xutowafom.pdf
    • http://fernandopelosini.it/userfiles/files/palumizopidiz.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b34ttndibl7sfrtl1r88jp0nl0/dawiramevebijegexewiz.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/63e3806159c220b67002ca91963954d3/zonuforimisurogula.pdf
    • http://agendatourvietnam.com/hinhanh/file/35348453232.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/2ac38d4c112d2b1c0399d1dc0929298c/21274972847.pdf
    • https://hirurgija.me//files/57900464072.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f80510b7a---peguzejitur.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f2a6802a1---bofatev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=turning+operation+on+lathe+machine+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf2.bin
e4042139d0813d2aec23f47b5e266aef63538a29b27b09d0b3f8b84cbff9ed75
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 10960 bytes
font_01_sfnt_off0000e3ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 16792 bytes
font_02_sfnt_off0000fbfe.bin
da04f168d4c9573d076e28647b3107c33ec6c18acbbf48ed75f4eeb61087f3b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 15888 bytes