Malicious PDF — malware analysis report

Static analysis result for SHA-256 423b2265950b31ae…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ec50b39101d48acf01c4f8b51fa94770 SHA-1: 9b84ba71721a81e5f6d5a75cfc6e14afe4d9c481 SHA-256: 423b2265950b31aec3f7bf781c0393d9200d46b2b1ffa0412e05068ea4df6512
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://freeski.hu/freeski/file/pixigegitorutixazujud.pdf In PDF document text
    • https://georeno.ca/userfiles/files/2945464864.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceda8ad1d---15513395974.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/97993618877.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tofiruguzanekexa.pdfIn PDF document text
    • http://tzsunup.com/upload/16141471934.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/91763041463.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/12373141330.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/87492331801.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/pejagezeped.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f9575c86e3642345ca4506301fffa676/boduzefutuguxo.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210914184843410.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/28481489801.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/kulakixosemajomefoli.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210901_023653.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/15857225316.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/41998898257.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/30680069284.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/12356910219.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/32e2mc06meo4u5cgdbfjq1jb37/30708740036.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/15923044870.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/93873768217.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/panivese.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/limokizimonomin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=outlaws+american+stock+car+racing+apkPDF 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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 17344 bytes
SHA-256: 3e78541ed5e45ff01e10268ff6a98ad64a083f6da8da8331d5f53a8f899044ab
font_01_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 11020 bytes
SHA-256: 8996fda01bc88853c70d281288cedcda66d4f226cb67ceb6bdfda6e0ce40d418