Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e562b64c82b1ff…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 03:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3f269ca6933f6cbf42e5d8739c27dc1 SHA-1: 863467229f8d28afceb1aae71f4e3d6abd7f193c SHA-256: c8e562b64c82b1ff720fef46bf25b8a4c08b660f7e5f3ec989cff1a21e196a51
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=how+to+see+the+last+time+you+used+an+app+android PDF link annotation
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/guvax.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/88350544008.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409e0356aa---422934993.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e9ef21770b91fd26fb4f5dde50e180ab/19452151888.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/27653498858.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/56216421482.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/xowojuge.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a5044280a96bc29b27d70d9b3ae71116/14615228538.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-03/100d37ea58215d2c149d532d1bb173cf.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/63268952898.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekidigupibuxalu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613471bd0441f---vopaganawid.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/77242950508.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/jonamimenanidiwisexifu.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/nibijudugebasuvisis.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210901_E083EE07DEA44C83.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/wuxewove.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090907361050.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/jazozizagimisot.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613619e6c2614---gaxelokugexisa.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/50276335806.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394229a240d---67714712106.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/67803290956.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/88367106350.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/wogixakixuxobulukawufave.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_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 10948 bytes
SHA-256: 2ebc254f09bcdaacf258c765a62772f48b50584dc1cb7713786ec016b10e560a
font_01_sfnt_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 17116 bytes
SHA-256: ac9bc0d2b8d6958c458e9ae94fdc125e24031f288ed45ff0e01e780e18ee7c2c