Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1813968855445d7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b838d2f8063cae71bced6ee6520b731b SHA-1: ef5eb0f4b0b6f133aa804946288f9e9dab98ef00 SHA-256: e1813968855445d7cc1e6092e52f2a18bc88a434b7a2a99476168f662cf0d103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://swiz.eu/files/editor/34608764109.pdf
    • http://15881588.com/ckupload/files/supafawu.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8cbaf5bc682d939c8e0efccaf70d2ca9/bokofe.pdf
    • http://lab4050.com/upload/editor/file/kimijifoz.pdf
    • http://tythb.com/uploadfile/files/ronobefikowulef.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a1aa3180---tizukowibipaxegoxa.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f83e4e15---36676537056.pdf
    • http://ellev.fr/upload/files/gelukixobiganalujefatenu.pdf
    • https://8cj2aja7-8mxb.com/contents/files/61409485377.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416462b3944---xetivopiloxamokinupaz.pdf
    • http://chickendaylacrescenta.com/uploads/files/buxasokof.pdf
    • http://sdes.in/uploads/31616894328.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/83691515.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245817dc0c---vawun.pdf
    • http://tuecpa.com/file_media/file_image/file/16735638387.pdf
    • http://ikkosushi.com/uploads/files/17863117384.pdf
    • http://szyqjsj.com/UploadFile/file/20210902054518590.pdf
    • https://calprin.com/ckfinder/userfiles/files/75050028504.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/pojida.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/83772468344.pdf
    • http://freestyler.cz/img/file/wewimudimemivemanawikib.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/75977882673.pdf
    • http://surausa.com/uploads/files/lumetex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+wifi+exclamation+mark
    • 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_off0000ec0f.bin
db76ae59a72fe8e4c1678a33cc059d2c473ebf24072ec429c8a7368374996f8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10732 bytes
font_01_sfnt_off000104cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 16792 bytes
font_02_sfnt_off00011cdd.bin
630bd8f097a2522e5a9fc1ff33ffbf2a690158894e20bc4092852e5440431777
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 17484 bytes