Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d10f91b2b7dc579…

MALICIOUS

PDF

72.9 KB Created: 2021-08-30 12:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d382e22aafec1132bc434394f2f4281a SHA-1: b2a441f9c8a6b9b3817fa147e8a1d1289f1978d7 SHA-256: 1d10f91b2b7dc579b11a293f1505e2e1b53875e13e65812ee5893e836e5df69a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://verypool.cn/images/upload/File/45380386399.pdf In PDF document text
    • https://puppometalli.eu/file/wezevejomisil.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ae6r0ngdbgfr6m7ts5lj5oo2/7254484910.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pixanubit.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/11541092167.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfa0ed1299---kajasenuxinijoluwu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b726b848c389ba5d29bcf99ecbbb1377/fumakugefetuzu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd4c0ed435---34811015138.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e489ccc71ed---widedabuf.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b215e4a2---16500405626.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021841135441652.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4avr1m5aao7gse8l1aip3gld3k/30323172775.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/31084399272.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0babb9oj35r0anh80pks609udb/gogatizafibibulejin.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfecd97bb23---16814018571.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/23k5t6n4dhetit98o2qefr54f4/bezakomojaliguban.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/18063610394.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7aa4122898d0f713dd7484c9c08e7abe/jofegiwokulalet.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8e4f7adb09c7486c857175fdd59073e1/kiwebapasul.pdfIn PDF document text
    • https://tmtteks.com/files/pipirani.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/duderof.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/patajalotegup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sexual+reproduction+and+genetics+section+2+mendelian+geneticsPDF 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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 14880 bytes
SHA-256: 8276fddcc90a40dee137866bd24a6f02271426d2c5a5ae0349c5d07970292e75
font_02_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 11256 bytes
SHA-256: fd00a20961c639739aa6a4cc47d1416550090b300c561665ac75a2c5947082ec

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