Malicious PDF — malware analysis report

Static analysis result for SHA-256 161cbe6d5ec0344a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 03:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c404659a9ae49c9a195e02dae18cf3cf SHA-1: 4cd7d7de092e28a5a8ca362095f9481b33474040 SHA-256: 161cbe6d5ec0344aa90f0aaf182beccf26fcedff806aa1294b32cc8dffc06c63
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and links to compromised websites, suggesting it's designed to trick users into downloading further malware or engaging in phishing activities. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b26b79215a---59809593045.pdf
    • http://cnsgafgl.netsociality.com/upload/files/5840453687.pdf
    • http://factory-01.com/js/upload/files/89155064752.pdf
    • http://trip-sale.ru/userfiles/file/gulotizokorexakoxosawo.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139507fe5b50---fojopovap.pdf
    • http://hnc2.com/userfiles/file/wevenubavinaderosepanonep.pdf
    • http://studiofantino.it/userfiles/files/97933050688.pdf
    • http://ranjitabiswas.com/userfiles/files/wadigisutifumiligur.pdf
    • http://rungruangsteel.com/public/upload/userfiles/files/21251678215.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8b6622b7e88322525025758253b0a060/kukovurigugifaxakuvixid.pdf
    • https://durimawar.com/contents/files/toduzix.pdf
    • https://redac.ch/upload/fekosixibivis.pdf
    • https://braus.uz/images/shared/file/dozidojenowina.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/49414341796.pdf
    • http://udmvdpo.ru/images/files/40300933042.pdf
    • http://elitaliaweb.it/upload/file/3960209265.pdf
    • http://lachambredechos.com/userfiles/file/94583711548.pdf
    • http://abwmountvernon.com/uploads/files/77747937025.pdf
    • https://marblobaths.com/app/webroot/img/files/bidogodafo.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f8edcd7feff3c1fee376035012cf198e/sevifisizawodem.pdf
    • http://vanhacollection.com/images/files/70439825926.pdf
    • http://ser-buk.com/userfiles/file/sojadinugiz.pdf
    • http://dafangtour.com/fckeditor/userimages/file/rukoxozimoxe.pdf
    • http://philboyd.com/denuzejamifufoxopanuku.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/kovokefedawiwikoxu.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/kuwubolulifowodux.pdf
    • http://elma-itc.ru/!upload/files/25593904366.pdf
    • http://elistaprezentow.pl/userfiles/file/lopunuxom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=play+geh+4.0+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C8 16792 bytes
font_01_sfnt_off0000d0da.bin
6666399837964e51c7387dbd6590fbdf90373fc0d5fc4cd5ac4ef3d33e16ea4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 15588 bytes
font_02_sfnt_off0000f84b.bin
cb79c7aa3138e467f32ba9967e5554d09f8555af05cf761d5621d8e7eaeb54a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10324 bytes