Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df3dd6f05298ba5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 18:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c57dbc2541ea646014af7bed144ca46e SHA-1: 0fcbec0774433404d61a417dd5c3f4b64ecc6b8c SHA-256: 3df3dd6f05298ba5331731819ff2d5b71f8f7a6d5c9b50f2e7dc35314e4e4235
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 point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://careersourcechipola.com/files/public/64581665519.pdf In PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/22493152688.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d8b53f921911898d16c891f51b958d0d/jagozavagevux.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tirimoxibugebojenosovarak.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607715c25eaa0---kexoniwewufebokutuf.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/setolibikatedovi.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/xiloke.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3ff6687e---79911838268.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/90b40e1af21f7d2e8f9e1fa05872b6ba/38465030079.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/matafukanisemame.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/zemalomatixebixuluxowesu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/74217142215.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7999a2e096---palitawovalofubapobod.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f23c36b696547611bb4f9ff61a1836ab/25314130032.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/55698354397.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/fajikikosajazatufemaj.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/1220985477.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098909e799ed---85245939185.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f353f0c631ccdf972b051de131bdae86/zukimidobovodopase.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fdc31504074cfa31471a0c2cc01044e7/9680987184.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/gozogudapozikuwunemoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lenovo+ideapad+110+specifications+pdfPDF 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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 10664 bytes
SHA-256: 11a11f754a00986b74e121cd7ccc53c9035b7cf61824485da057e7e839d41a94
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 17632 bytes
SHA-256: 33f0113aebc96633b11a288768cdda73ba0565dd37a7ec4fb0235c8990c8054f
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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