Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a361f3521d2de5…

MALICIOUS

PDF

106.3 KB Created: 2021-09-10 02:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67b1a0fa35675f1ec07155ed971cb49a SHA-1: 1dce0d300c35fde1c71ba9e05272975d499e5c38 SHA-256: d0a361f3521d2de58435692e6db942adb877977fabf1476ce929b8fa50efc3c5
236 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute further payloads. The presence of a fake CAPTCHA lure and password-protected archive instructions indicates a social engineering attempt to bypass security measures and trick the user into executing or downloading malicious content. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=how+do+you+get+infinite+v+bucks PDF link annotation
    • https://tidaksusah.com/contents/files/4562386632.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/gasozojigazudix.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/54189371904.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/49199937810.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/gapowedobubu.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/77382719391.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/43015821917.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0ca396a54b461d1fae982e0f5f19cb98/sesiremexujepipoma.pdfIn PDF document text
    • http://brukbet.com/user_images/file/57642912853.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131780e98cff---megajule.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210906094607.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/mepotalatubasi.pdfIn PDF document text
    • http://praguetransfer.com/files/file/wifogak.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161382b695c4f5---loguzabepojawat.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/79705932317.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/xojetoxavenazizuxuguda.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/nutuwewol.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613230fc50f71---nivizoturofiluroxasebuvi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bd22c148dae10fd7d49fc23ae5da0b07/rovodalava.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5a42fa79b92df33573b12758377d36e4/budiwabak.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161376943f2c29---xanofokuvug.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/jexowowarorudifoguwas.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_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 21012 bytes
SHA-256: f98972e6f726647faf2646960102f04149dd1c296b8df831c302e5002c4ff4b1
font_01_sfnt_off000169db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F2 10932 bytes
SHA-256: ca041ed9a94acfd6581afc12f67c2d190ef0c61ac88275fc4e427cdf87295edd

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