Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d0f3d01554d8a3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 06:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb97e13753f0d4241e159cb0c222ba40 SHA-1: 0df9bd6a340f9670e1bde475f69e3b2826180bff SHA-256: 81d0f3d01554d8a33d0cdd5a5bddcb3adae23a9db8a00fa87f2d43a4b8927951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and employing SEO poisoning tactics. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wx-bm.cn/upload/ckimg/files/202109132254221694.pdf In PDF document text
    • http://iact2001.com/userData/board/file/rexerewelunodipefewugoku.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/12196714144.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/kunegibarosafaxifezifer.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/6213951568.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da1621bfd22c7add26c1c375270e2f6c/24895165479.pdfIn PDF document text
    • http://thaide.org/userfiles/file/getevob.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff4d114456---jowiponixeworufowopifugom.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/44994697900.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/68645070716.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xotozoxix.pdfIn PDF document text
    • https://vendax.ro/files/file/78705602261.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/48789210907.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161357377be65b---batipaduvafub.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/nakasefitaxeva.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/robapigagafamo.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/88956197598.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901071430_1336696146.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/tosanoko.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/wevuxodafegosipu.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/16957884804.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-14/20210914082207964886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+apps+for+samsung+galaxy+active+2PDF 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_off0000bfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB5 11380 bytes
SHA-256: 0c76528a788ec8c002066855c08954c856cba560d5ff8c8d8c72c59fd076adc3
font_01_sfnt_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 16712 bytes
SHA-256: aaed6d4abcea1db2ca071098f56e3c6921971187ffb2a571800f6ec8ae81fd0a
font_02_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1