Malicious PDF — malware analysis report

Static analysis result for SHA-256 709bd329ef4c4ac6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 11:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b8a3370de7a387e2613e460b828ee07 SHA-1: 2d9259e5be74abcdc0964e002a71da6a43b6c63b SHA-256: 709bd329ef4c4ac66e604d2e483f7ee292c5c361e8e3992dc0f14996ebe2cce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://email-database.info/userfiles/file/28390555580.pdf In PDF document text
    • http://sinoorchids.com/image/file/gumofipajazejakafa.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c5df143a5827a766052bbbee8c912412/gosano.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210909074225.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1df2d0b8650c449b5815f4a4e097419b/75899932529.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/27029743045.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/86877077725.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/84361002598.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/lororenabobekade.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/92556442711.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38540277603.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/84943606586.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/4368293707.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/kewutumomubi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/38201937062.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/69463610532.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/26300542237.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/sakuxepafoj.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/lusibojane.pdfIn PDF document text
    • http://skncn.com/u/files/vitulidabim.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/29bf9e3dd733392515a5b2b9c33dadec/wekopajakojejuxenexu.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/fudixisesipivazomi.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/basonuvoxabovepirir.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/83832795521.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/wobadodolufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+hide+an+app+from+your+phonePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/29902587572.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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 16784 bytes
SHA-256: 4769427df445ec9f59f6c614ec90dac68eaebc644263cab485a5813285dfeb2e
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 10840 bytes
SHA-256: be02ae5e1c861464a36e0f7df415ae9a872962e67bf77d23c4f96b9fe49a820f