Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cefb16371c7c315…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 19:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef2e67e8e049bb0a6a3e0be6dbc34d54 SHA-1: a6a34d6d3e760964279015eedc6932ec04dd467e SHA-256: 1cefb16371c7c315beb4e74ed4109d4424f767bb99619601130deb60ae13517d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=a+quiet+place+film+online
    • https://marlin-shop.ru/ckfinder/userfiles/files/30016239037.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18f5c159d---66137085471.pdf
    • https://swaarm.de/app/webroot/upload/files/32598319840.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/lujege.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/jelopumajomiladobilozimij.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c444155200---86665158909.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/nalapudedisejiduza.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161461b738e8e4---5775231712.pdf
    • https://sofahatinh.com/upload/files/forizoluborisisedipix.pdf
    • https://alteanetworks.fr/img/file/74769770114.pdf
    • http://lednotice.com/userData/board/file/51495497136.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/897a6d9bcadca1bf76b62d5daa75f130/xazupozerufajifadoj.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2e272accf---lubopapupefagijemuvofalim.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lunoxajedazejel.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/22f62a6ecbc1ddc3b1febe734b357542/7732312065.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/keropusefodebu.pdf
    • http://koryosushi.com/uploads/files/ropux.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/95860532547.pdf
    • http://chinawin-consult.com/userfiles/18950892138.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729c6bf1bd---fudan.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/efe2008e0ed5db0739bad5f523ccc1cd/riviga.pdf
    • http://modernplating.com/userfiles/file/5417326742.pdf
    • https://bonvoyageindia.in/ckfinder/userfiles/files/73173320303.pdf
    • http://afro-safari.com/upload/files/55930551833.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81ee3e2c2---navawupo.pdf
    • 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_off0000d72e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16792 bytes
font_01_sfnt_off0000ef40.bin
c47fd657b1d2b1ef3cef2b73a7a0cda10494f1114afa81a15d30d771315decb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 17040 bytes
font_02_sfnt_off00011a9b.bin
34f9c52e7e8313eb9bec5b182efba7d39b611e5dac04253e9e621de9bea743c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 10600 bytes