Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac462ab1f939f3fe…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 23:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd6f3846c7d2c7ade55a8ae6a5c843a4 SHA-1: ac411b7d591861c275e878509b1914d03de5d45e SHA-256: ac462ab1f939f3fedf572def5231f07d7f9bf2c1f7b896cdfceb23bad5f1eaaf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=how+to+connect+to+chromecast+from+android PDF link annotation
    • https://alley.52886.tw/uploads/files/41743364336.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/genibowe.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0de89d2cb---4217359824.pdfIn PDF document text
    • http://emannsltd.com/userfiles/rudewenumalaw.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210902010934.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910125932.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/valijisobiri.pdfIn PDF document text
    • http://stefani.cz/fck/file/disepexonorus.pdfIn PDF document text
    • http://obuchenie.bititechnika.com/img/file/rubaradisezo.pdfIn PDF document text
    • https://harom.ro/files/file/nonaximetudaxuz.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/04/kipumulij.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210913/file/16314740986039.pdfIn PDF document text
    • https://parfumzone.ro/files/file/23340775.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/22945473187.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091319135161.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/venebasipubefuj.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/89770264125.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/1g0aro5p9sdb0dr4jk168k5ht7/56365440508.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/mejefe.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/59272728468.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72518447109.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145f36cb0836---31388331588.pdfIn PDF document text
    • https://datajournonepal.org/files/55881737387.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/78294732538.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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 10772 bytes
SHA-256: e4f0535ff298a2c64ff1af39098150028087b8ae4dbe6d275d178dfd758e8201
font_01_sfnt_off0000c946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 16628 bytes
SHA-256: 0b2289f9a16b113deb964847f0a4da9beaa8a31a0a8508839cb8851658e201f3