Malicious PDF — malware analysis report

Static analysis result for SHA-256 14303d91e2716c2b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 03:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aca60a44556de575fff16be65625facf SHA-1: 08e1659d880d5e0aa7c2a9c9d95243ffd7bb0b4e SHA-256: 14303d91e2716c2bec562dd09b42ff2c7e1af28f427b15051b983ce23bfb8198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs are indicative of a phishing lure, likely aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=touch+vpn+unlocked PDF link annotation
    • https://boyanbolyarski.com/userfiles/file/lexagalagedanep.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/57706356985.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/pomedifajogisufoj.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/soxetewonizulexezumosod.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2c4kpd24vtdbon0gq9a49n8924/vorogimorutigekepigop.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/wozivewaseguz.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/25314754560.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161344165279e3---tixaritebaxugipevuxiwok.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/26113532802.pdfIn PDF document text
    • http://tatooazh.ru/files/files/mixupisabo.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/44392002558.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/geposolelijugawez.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bf5694776a51cfc65d915d5f4f5f0d80/75596383511.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/84392897895.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ndefkd0pli1umk8u6j5534cjmt/44333244240.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/32956977839.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/88278548644.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614185e563d6d---95123707906.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/debujaluj.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/75645073958.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/23748113591.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/kibabu.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/88881628760.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_off0000c15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 16592 bytes
SHA-256: dec2a918b3f3398cb55970f415c2d5795bfb5aa8444aaee8ede70223e6c706c6
font_02_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 10212 bytes
SHA-256: a5bfd2f7a3da1af88f396652ef70920936a9f07e8f56a778889798921c650ea6

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