Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c0112f54a460d7…

MALICIOUS

PDF

82.4 KB Created: 2021-10-08 12:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 285d4af36c7c3532095b38f41afc6ad1 SHA-1: 5f0dc5e4dc452d3dfc1bf612357732ad04b117e8 SHA-256: 85c0112f54a460d7fba063632d09a37dab972fc88c577ba8f6a481da9b902348
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=chemistry+question+bank+for+class+12+free+download PDF link annotation
    • http://melabo.com/upload/files/molupitebokukigupovi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/bejafubilidu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615736847cda7---36876295723.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/wobenilusibuzilutawep.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/56643113461.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/texesepebunetevolakuw.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/puzitidut.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/18933113593.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/48362450019.pdfIn PDF document text
    • http://a-pluset.com/userfiles/guponebilivepatubexez.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/fonivopuzuw.pdfIn PDF document text
    • http://bdsductri.com/upload/files/97442876689.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jezazuguzevojumomakos.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/razutuzatax.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e72ba230---10012691128.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/lulubuwolakevewag.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/duzujugedadabere.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/86075244886.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/9691297504.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/34982944412.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910150913.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wenokim.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/jakevitured.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/91873237687.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fa35cb339e---58479650814.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/zovurusutanusejoxajog.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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 11620 bytes
SHA-256: d653df0a2d3e7f53e7c4ea383d8a15d8fe0684325d5fb75d9ba8edb566dde281
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 19224 bytes
SHA-256: e9161347bb13f990a2bf923f0e32b33121276245fafc4d6c1f9902faac77c873
font_02_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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