Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406690f03de8605…

MALICIOUS

PDF

84.5 KB Created: 2021-07-03 15:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e72013e43053abb80e55548c79e96c4c SHA-1: b9be786abfe49c5eafde691c14ccfec7fb16abec SHA-256: a406690f03de8605b5e6d5da82d23627b7d73ac37d2223a7b0500239fc8ac20e
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for gaining unauthorized access. Embedded JavaScript streams and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nada70.org/userfiles/file/99510504116.pdf In PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/patimepidesezavizifenofu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b9561b70---1050208815.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/komugux.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4pdm0miei5q6l8qpnc7lvue76r/65644149263.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adba19983a---32429874827.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/aomf1gfannn5j62fu6hgbic2oq/22949036734.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pomuwizokajevidanuvolof.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/67332440114.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cf0ca889---sitoxaburise.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160970d3682539---sufetaxitisen.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1abf48dbf7dd3776e4e31d8120df9aa1/mekur.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c69d67fa7c870bdfaace5aa7405b2a55/80032261959.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1f391rmrdgm9p1nqga88h6hun4/jugifaneweviwu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q408m9flm2f12smbb2ol7cjle3/vipurodosawa.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f3cf0449f73b345e8f07cfb7b2b87faa/nebeneguxadagumikesonu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/56249604522.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93000839c---pazimesebajizororewuzumo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf76b97823746bc9cb7956e1e5aa30b5/88164117137.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a905a1eabcb---gesilalu.pdfIn PDF document text
    • https://schmitz.cz/res/file/pojirererapaxo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7443547990---64443667134.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/midagigibaw.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/zufubudamapujaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dogs+with+two+different+eyesPDF 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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16600 bytes
SHA-256: 6c1d0fbeb3666d9bfd0865d883d48d9701834ee998f9d5f4f56fd82b3e965723
font_02_sfnt_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 10628 bytes
SHA-256: 582d076480ca817e64f658cf2209e39bb51d803ed2a70274025c9d7f37a7207f

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