Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e75f6df085a844…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 08:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbe0a2bbfc301332c5bf84f135acc8fe SHA-1: 4130b7df07eaa33c2eb7ad518997c12e63889bac SHA-256: 13e75f6df085a844c40a51e18400bf3c36cfd5117b96bc0226ea9033f89eb740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a download or redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3394307150---dexopipajovadele.pdf In PDF document text
    • http://ccshecea.org/upload/files/95748759650.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/lixazukaseze.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160887f86f1cf8---pelulowopivusubixija.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/56045560949.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nnsvh4kvvs472tifvebeocsln6/25746883072.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/30714031971.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/3539c3815ea510d873b2eec89b165396/23396240008.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zufuzun.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/bameperi.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/87769797633.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/67931365956.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5c85b8d39689246c68d425264a8f465c/64872169840.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e1be0aa8d7a11b623e89baaef597e1d0/gobalisudokadelajarujoze.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/5943436637.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085696ececbd---fijejamagugo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/53581104681.pdfIn PDF document text
    • https://icbacademy.com/upload/files/9191779372.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/saoa7m5lit6ik5vl7bsp6b6vje/padosarafokudifoko.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/megetikanuxisu.pdfIn PDF document text
    • https://hoalavender.net/upload/files/12075877062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=strength+of+materials+r+s+khurmi+pdf+free+downloadPDF 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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 11296 bytes
SHA-256: 8aefac628771b810eb40c94452d46cf793cb564f77a96bec44581df7846ef52e
font_02_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 18344 bytes
SHA-256: 240e2b62d37d20c291c2c82f88d02288fe4629997265431be691813e85ccb887

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