Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a8c21038bb956f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 18:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 202da5a0dbfa7da5c960cc4900bf2f7c SHA-1: 8ac6a53fe231a2ed0fec06b5e97b242510f35609 SHA-256: 74a8c21038bb956f539d2e30b46ee57df462609428b2431ca0d03bf2edb4dc4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=script+aimbot+krunker PDF link annotation
    • http://jmk.kr/ckfinder/userfiles/files/87445314102.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/50170560613.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/mamojixudutel.pdfIn PDF document text
    • http://vaynhe.com/upload/files/gewisowinotat.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/78545072438.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/47281385953.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0b7ca603a21de09daa5996d7b1f05a58/paguwike.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210920141730_dokbtf.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/jigewanukatud.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/458fd0514380f324bf4f57f7cfd5a884/tujudowuvipinoki.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/71743187466.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/82469990606.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/82218588674.pdfIn PDF document text
    • http://aimic.com/userfiles/file/49801965067.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0d506dec---segepitinomumoz.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/nazamosoza.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/valikaxebusuwunasagedep.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/86497043950.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358939a174---waladinabepumosa.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/womimudarofenimep.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/fikabenox.pdfIn PDF document text
    • https://dacola.com/upload/files/33957732556.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/81875637637.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/xiruwofipukedafo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad13eaaa5d---satuvanura.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_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 20476 bytes
SHA-256: 3b273201e874c275d2611a3c03df7330eea483b8644706aab4783180f9b6a527
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 10728 bytes
SHA-256: 13fb88a6796751c036ece3106c99196f2022f10f5e2a9348de16e5e42d6e4232
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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