Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a510d88a34f5d9…

MALICIOUS

PDF

94.2 KB Created: 2021-07-19 05:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42fab3ec197be8ca7899d5e9fbdf295f SHA-1: 05f2390896ea18ae9e01771ded76edb730d67c65 SHA-256: e0a510d88a34f5d945a2c340ff660ad2bcbd64f643f3f1ad0f190400427643ac
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of these links and the overall structure align with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/risp6ai3nsd7csg0i6jij900k4/26962564923.pdf In PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/11347671305.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/74959923176.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160856e359eb29---zotoviwojuzatotokonav.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/9lkhmbie1hsn394d8k2lm0v3r9/rajagimedopafimizus.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/na1ia87jekudp1fn5tlio7crrf/2701440002.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/34144723076.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/sapej.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/18744176572.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae338a97e---jegodunimiwojamup.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7948aec9---wobikalekunadoviwam.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/15044655559.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f79b47c7---xidajutuwulasetobeb.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/mesomuvisigumima.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/sixex.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n96k5e39no8rq8q3vqum31jvk2/mimajorerusugovom.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bf1boeq82idopd9bsq8btg5p11/79439841883.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/lixugabaso.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/4366463125.pdfIn PDF document text
    • http://apvn.info/userfiles/file/bukuvowizi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nuxukubolelujojokegoni.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a250d7a9233---zekorogiredewawulevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=window+server+interview+questions+and+answersPDF link annotation
    • 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_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 18000 bytes
SHA-256: f10d88fdd5837970a0d5ed284d02a5c5765f8ec745c8053f9f2564a1e8f6544a
font_01_sfnt_off00013ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 10588 bytes
SHA-256: a3bcf40ffa4b3c3f48b0a08068e6dd76f7f5de591d1b0903521dff7e47df4650
font_02_sfnt_off0001530f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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