Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0ecabb05a53b6c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 18:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9489348b71325c5a8e36d216637d9ecf SHA-1: 0ce12565e386b874d2db4cf4dbdfc1049d51e615 SHA-256: fa0ecabb05a53b6c8090a89e952c2b703e17863c108d8a43623a39701ca287a3
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware delivery vehicle. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or appear to be part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an exploitation attempt, likely via a known PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sandp-engineering.com/ckfinder/userfiles/files/buperakufepora.pdf In PDF document text
    • http://vekosgroup.ru/userfiles/file/8894301599.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/43137187256.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/6013670001.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109031315083998.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b48711940---43931060630.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/44453376314.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/34630020508.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/duwutusek.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/42696181473.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/nifotoramagilabod.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/15735591788.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e82a8fbaabdbe96b2cad6fb71036863/wowavu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/67kd0auj400e714hfl8786ttno/92943115630.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613627cb8dc0c---lesopuleronoluwa.pdfIn PDF document text
    • http://intertribo.sk/files/nizutipexidoman.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d7d5c8ffc31bb696f3fbaa0fd36374ab/fusikabutoremekepu.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/batodevaregewow.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/86802552547.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/bonodexinukugovibonomuk.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/82537989195.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dotejobekupubemewo.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/lenabinezuduradefa.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/29119255058.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/96066862869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wonder+woman+123netflixPDF 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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 17064 bytes
SHA-256: 1c974530d7724b476daaa3e32f02b4b95854e06684a17e50f0c3cab4c53548e3
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 10872 bytes
SHA-256: 50e28feb6ee2d1584c6438e08f1a9528cdf793d6071175fcee72a3de8847b958

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