Malicious PDF — malware analysis report

Static analysis result for SHA-256 141d9e875c4a0d54…

MALICIOUS

PDF

121.1 KB Created: 2021-08-04 23:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12c6c63750672ff8a82c1f7d4689b6db SHA-1: c00500500b810b8cc898a363e173365958308a01 SHA-256: 141d9e875c4a0d54b6dc282de9fd76848e4b9261e631beda7a19363f8767fe28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to redirect users. While no scripts were directly extracted, the nature of the embedded URLs and the detection signatures point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://balajihighfields.in/userfiles/file/66328000980.pdf In PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/2369078225.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592c1d3fe2---fomunikomelutab.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c46838b01---xotunud.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/l5ug47q73br14fuuuf5cu8vnio/562318758.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m5ckkpekvcjm3hhcfe1mnt2f3g/wurevisu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/susesizuw.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ab419f548---37754568618.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/19776725836.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/850e1a2e9ffa119db1b022c2fd3c36e9/bajazuxivava.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/jujudarajakebidabirarabe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35057d7654---winerimasuxod.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/65799675230.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/57937343793.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c3bc03c7---21444483021.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/mupozafenirul.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/187a291be368d2927475eb77f1f66974/79102215645.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/20992678771.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16208602061483.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/27428562765.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/81909517616.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/88228679230.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/88784676001.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/14357917173.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5a9ea79f3---98917354630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=b%C3%ADblia+ilustrada+pdf+download+gratisPDF 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_off00016b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B97 21820 bytes
SHA-256: 8dd159bf94cced06645c0d2050c22f173590af71c4566dc954e830c3598027e6
font_01_sfnt_off0001a225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A225 10980 bytes
SHA-256: 912910afeafde53248927d067df64b76334f3dfd54aba0a66590847585204c99
font_02_sfnt_off0001bb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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