Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b904f2c82f4575…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 10:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57414227be6f8e24972b59e92a618560 SHA-1: 149c3633abb3d3546a40bd25f247078bb35638e1 SHA-256: 73b904f2c82f4575de103bab2b975ded96bd9926d9a0362687e8c91e5cfbbfe3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm structure, indicating an attempt to redirect users to external sites. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as a phishing trojan, strongly suggests malicious intent. The primary goal appears to be directing users to potentially compromised or malicious content via the extensive list of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://philabc.ru/uplcv?utm_term=rooter+app+mod+apk PDF link annotation
    • http://shipagents.nl/uploadfiles/file/gawidubanimunazi.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210914_E547AFD4BB14EC09.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/virim.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/winizosajinomujirokol.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/69038294389.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/dobofadokamopijowivufeme.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/25867706854.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/roketopap.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/137524e660717a3c4efe4225e1bda1aa/paleruboxotid.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/48563315557.pdfIn PDF document text
    • https://ibextrail.com/editor-images/sejarigorofunolaj.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/fesufadaz.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/joxetodasoni.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/17069717624.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109020804583485.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630708941f68031e958c443c0dfe.pdfIn PDF document text
    • http://tion.hu/upload/file/57006958862.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614422b17f50c---80417958740.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/56360584668.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/sulokubamufamuja.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/073c398522e3db4b97a24035a37794eb/tapukoki.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210911/file/1631298194.pdfIn PDF document text
    • http://riph.pl/userfiles/file/legejabaja.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/xirowidimovokad.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10280 bytes
SHA-256: ea2802722486b325de5908b94ea5c34f949178f04bcc5ce27a9f13df467502c4
font_02_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 17288 bytes
SHA-256: 1f422dd7bf977777e157f823aaa0dca415f8e36fb39a1fe0c143e1c72540fbb2

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