Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73e1f9f431ac309…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 08:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3d324dbced5210d1ee9aa0ca8195b377 SHA-1: a8d4fa8a19d127689b26a9f31e9b741da92c1004 SHA-256: f73e1f9f431ac309453c4bd1711b75eac41f306ec8fb19c5788dec13a6fb7ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://edv-denk.com/userfiles/file/1812068906.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dufiwegamuju.pdfIn PDF document text
    • https://esz.jp/img/editor/files/25346185233.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/58994274417.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/c0n23h7344dr5g9cu4t22g2h6o4f22a5/87953386454.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/sapinisofu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/78695035351.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/44715746199.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/58647143121.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109061753376140.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914125955622542.pdfIn PDF document text
    • https://vanha.kokkolansuunnistajat.fi/ckfinder/userfiles/files/81402297164.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210926065456.pdfIn PDF document text
    • http://oodow.cn/upload/file/210912152315895402gp6x3bwabjs5.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/pajexunokugow.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/30018918724.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/nafekamomulawenadoporut.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/10205797712.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/79962501454.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161449730a91e6---bekafarevutesizikup.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a36f14465e0027bf80bda33eabeb2bc6/41840116950.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/9260534613.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/206215647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=new+movie+apk+for+androidPDF 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_off0000ae05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE05 14844 bytes
SHA-256: 71f72ae354c6ac31381db450d98e0c7004e438e9766110843563055b42650c56
font_01_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10568 bytes
SHA-256: ebc035ba903e9ff6cd655ddaba12be029b94d9ce1587d046c99275a455fec24b
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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