Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dada772398d051c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-02 11:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bbc83237958063389cae44024df93177 SHA-1: 68d2e45a49aeb49540709674f4e1c3848dff1425 SHA-256: 7dada772398d051cf5c3f1de854a2af62ac102b71ba1872b3230b84fb0bdde7a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=medical+biochemistry+by+chatterjee+pdf+download PDF link annotation
    • http://bike-aholic.com/UserFiles/file/4367022114.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/19450054281.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jukuvuximesuwalomawuwub.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7vlgr84q165fdgqv21lfqim01b/70418403421.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cd0dd08e968eebccf46a9b2955592652/gusimumibojumegaxagiw.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/95597923981.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/89076154347.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/16767353390.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vupexapod.pdfIn PDF document text
    • http://enricobarraco.com/files/jonubepawozipoketudaze.pdfIn PDF document text
    • https://netpage.info/userfiles/file/jitifitepogaso.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ed068bd72bce2b6e75dc6c0a4302e285/jomumigeferi.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/48312401004.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6e87c04d---zexojapuronebesawad.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s1mo14uta6b1brj67l19ut0run/wilidotu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/zusedin.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/99434404088.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/kivoditawere.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/92878589764.pdfIn PDF document text
    • https://oasis-travel.ro/files/vopesodoxufoke.pdfIn PDF document text
    • https://yassinortho.com/userfiles/file/66767353939.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/xilizexafoxalifatuw.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/totupuzufumuzugurol.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/funotutiruwas.pdfIn PDF document text
    • http://goldia.cz/data/file/40587001334.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/nodofozosomowaxasizuxala.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_off0000b285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB285 11348 bytes
SHA-256: 081415dae30fd3875cf4369b620c25781f1aa9139095867d1d8f348d5d5cee56
font_01_sfnt_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 13960 bytes
SHA-256: a58706f0ec42bb7a736577d2ddae91b78a8283a9352281f37bc05f46ab787630
font_02_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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