Malicious PDF — malware analysis report

Static analysis result for SHA-256 413d200a99d77106…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 21:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 747a4a8910d859834c19f4c14b1c0744 SHA-1: d3c5cff6ae56142279c7fb340d56f8be40557e1e SHA-256: 413d200a99d771069dbb968112c1cd3821631dbdcc208b8cc281a05b15cacc52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of an AcroForm button with an action trigger further supports the possibility of user interaction leading to malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://crysiq.ru/uplcv?utm_term=how+do+you+get+more+internal+storage+on+your+phone PDF link annotation
    • http://svsteinfurth.de/radsportfiles/file/xexelisivurorubudekanizos.pdfIn PDF document text
    • https://theurbanthinktank.com/files/nutemopifetarifudosuzo.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/siretuxiwomiviloza.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/birununiputudu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/74cbaf3aef0c718eb0d7429620321228/43009601422.pdfIn PDF document text
    • http://storemisr.com/uploads/files/9131505179.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/43105110556.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/vudozazogafurixa.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/numupirudoxadiz.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/72160232523.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/77016508362.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb60c81be---26472599662.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/lulitalepurananogewolowuf.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/5a0a53ae82f223a996504e2765f83ee9.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/85355010512.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/levupobala.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/fitotozevozaxixuxezitijo.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/wewunuzalubu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd7b0d2e64d5d7a89f837b805d0d1e9b/79067797481.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/34279592880.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/89612945277.pdfIn PDF document text
    • http://master-vin.ru/files/file/50502309727.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_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 17572 bytes
SHA-256: 38054936f3ccd0ce795c759e281c134035859e2d5330e995f2ce6f29905a8c87
font_02_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 11132 bytes
SHA-256: 1837155dd6dc14adc57e1003098165a2c590c99f9bba90e268d1c37052a3b97c

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