Malicious PDF — malware analysis report

Static analysis result for SHA-256 194a4e31e7356bf6…

MALICIOUS

PDF

87.3 KB Created: 2021-08-23 13:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31cb48aea6008dacc9c51dc230fa62df SHA-1: 5b2548be41431706f947dcbb48bc11faafe1f3ec SHA-256: 194a4e31e7356bf674bae6bd3b52c37ac730ca984416939bc6eb9c382b509cea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://pilot-market.ru/new/files/file/zudixumasem.pdf In PDF document text
    • http://panziofabian.hu/fck_kepek/34525559393.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/65859834588.pdfIn PDF document text
    • http://htwy.com/upload/file/56480522341.pdfIn PDF document text
    • http://mega.kz/media/upload/files/8590633874.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/9323909194.pdfIn PDF document text
    • http://prosquash.by/data/bipenorenulojof.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/99228959750.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/pepajekovumudalapadup.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/47018596315.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b1807aec---xoviwovewajilinasutad.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/62426997721.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/86138795021.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54619013b---junukipaguzadinibojax.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/98683222123.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/21941031193.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210719142058_4oue0x.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/40706345920.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/58e5a7cacfccbd682cd5daa44e5a5f35/pajede.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/luvakibinogojeze.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160de812302c67---zamududuweraragogebonuna.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a633e73a2---setewutopalasakikumote.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f979e2427---69646638515.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/85716226087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=modern+lever+actionPDF 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_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16544 bytes
SHA-256: 3dd5b5baedc2e5d13cb5d9636122e0a032feb97730e33d0c1cb03c4cab089a27
font_01_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 10256 bytes
SHA-256: 5b82990aaa5d6bb727f10bbb5f69c82e4b11b28066f7792d8f96b52532d2ca1e

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