Malicious PDF — malware analysis report

Static analysis result for SHA-256 e077f3116e762a3b…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 10:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21f6d73abe1572153c1a7e40378ba030 SHA-1: 6acb42d583961efd1c3304d37f7ba94abeeb9d3b SHA-256: e077f3116e762a3bdb0b64426862b8e98b4c03f1b022d847c4994e6694d29600
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=centos+7+commands+list+pdf PDF link annotation
    • https://cardion.dk/gfx/fckimages/file/lumufelerewosusefi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70b087820---sixufosepogatalejigosit.pdfIn PDF document text
    • https://denimder.org/resimler/files/likipiboxipegudakek.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/67263057666.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58a49220f5---mugutewedudizot.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e42a701aff4cc0bbfee16f15937a22ba/71039091942.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zoxov.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6cec050c---88252684858.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kefajuxafadale.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/kelanuvilejetipeginu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/rib4foljqarmvqsddjo4hub593/jovoxaxomemafeperax.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3227fba2---vezojin.pdfIn PDF document text
    • http://planetamama.ru/files/file/82023463925.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/panifa.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/kawumodibenizu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/971944ba428c87944dd6cba81e9eb962/31550960457.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/nixuwupe.pdfIn PDF document text
    • https://ihappywash.com/uploads//files/202108120046121265.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e904780a7e8---88635823997.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wagow.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/nonegozivusinorapuwisemi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e8323f9c---11179121153.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/kidevu.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 19216 bytes
SHA-256: 0cf3569f06db80ca00391a1bc3a4116654f662d7cab94d7245c63ca1ff5315f5
font_01_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 10760 bytes
SHA-256: 80b6be0629dc4ce1680c8a3f88ee1b6e8290db4e2624648b8021e820e39a2bb7

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