Malicious PDF — malware analysis report

Static analysis result for SHA-256 84846337d5242c46…

MALICIOUS

PDF

71.6 KB Created: 2021-07-24 20:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e23c8d1803cb56c86ec3ad4914afe444 SHA-1: e16258792b8e0b9741a192967296d158785cbc61 SHA-256: 84846337d5242c46b5c44084da9a301ed406661d3ae2d19abe6532a3ce7f49c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious hosts. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d1862dd8f00---wajapirema.pdf In PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/titema.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dcf908985---82631061403.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/repoporijig.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///rajik.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lokamujufovusoxa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7a833b2a86b6954343beca0ee883d0fe/lipelufigev.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/75735282889.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073b71fe05c0---bereva.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ck3o3lio7ub7j6b0dl9abl4hpm/12243750401.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2531838c5a09a562bc66d8809edb07a3/86704325777.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/70764603666.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/96753269493.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0l7fcdntug0fcodg3r5elgl682/79494542934.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/52154634046.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010961e269---96958000559.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/kutenosuninivi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/91932373701.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/985b6b81fc33936ef219d87b151fe862/viwup.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/51909120345.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/47232669288.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec3f389a0---11562347576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=filme+o+curioso+caso+de+benjamin+button+netflixPDF 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_off0000b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 11088 bytes
SHA-256: dfac725bbbfff99f349cb789eab0ade17da80aba8f27dce3ad72b94eafe24211
font_02_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 15916 bytes
SHA-256: cbfea678d602c3cc16632c97e3200673baa1595bf45f9b24a4aa287915136929

Open this report in the interactive analyzer, or submit your own file for analysis.