Malicious PDF — malware analysis report

Static analysis result for SHA-256 81169d459588ab9c…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 23:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f4c522cd1f15b8f47bd08441ac824c5 SHA-1: 351c3f65a96f40114629f6f865d3d461760a429a SHA-256: 81169d459588ab9cd119dd0b672a9915d662b04e9f8301384d64a536e67422ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms. This suggests a phishing or malware distribution scheme, where users are lured to malicious sites by clicking on the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3a4855dc07a4b86efa2671959b1654f4/foraxazoxudevenimuvuti.pdf In PDF document text
    • http://massimomoroni.it/userfiles/files/furipukotuboruse.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/42481609827.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cacc31736a2---diketile.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ef91b80b---69410326632.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ivslelb5qjkii3spihc66s6oem/xumenedipibux.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1c956f722329e956954d9ac47cbaee86/pagujawipe.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5a8ab973471898bcf5c03a474c46255b/67183465141.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4c30937bf020ea36e41e373c1a146110/sovilefuxubizifewaxifene.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/juzupimatofesazarefofava.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086464081e5d---sezivir.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f2f3790c84d8772fc92b75b82309eb44/bisanuperimosamenunixig.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2161c52855e85ba2f4e4ef93d1f2a77e/zivisepitixaf.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8018815b1---3787922471.pdfIn PDF document text
    • http://short-story.ru/upload/file/puwafisifabit.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c11a1c046---92661479733.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xuzonop.pdfIn PDF document text
    • http://www.bash.cl/media/file/bovirovana.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xedokufaluzijimanuna.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xonozekinaputinirumoki.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7d2b2677---47844551130.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8b1486dc963322e808dce8f91e9ebf76/40220453726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+the+word+claimPDF link annotation
    • https://mediaget.com/userfiles/files/23639898517.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 10836 bytes
SHA-256: ac60b557123f03b8f302f9eb9aea77045e60bfb30888c09c30b3de6dcb620cc7
font_01_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 17372 bytes
SHA-256: 7ebab68ff96ef50cf147a7ab4d3fa1025f5b6efb291fa35528610ae4232dddfc
font_02_sfnt_off000151cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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