Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfc0ebde1c2bba1…

MALICIOUS

PDF

93.9 KB Created: 2021-08-26 13:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b183cd6223f61b03f192d95bc5804989 SHA-1: 6d3093915ef7a73a478973c6eab81d68b5def6b3 SHA-256: 1bfc0ebde1c2bba1eb2dedd6ce15060ecd7cabd5d344c5c0e7b5091ad5254950
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://oniceh.ru/uplcv?utm_term=top+co+op+games+on+steam PDF link annotation
    • http://thuocamakong.net/userfiles/image/file/japolokesojafigutu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/durewufubadovamaxu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd4c7403e---kowowevuwivinovem.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/zapibafugazene.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/12002163146.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8fbbdb3e---48539075067.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/50064669718.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///78861385769.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/27291763105.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/8717542547.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/bitidosesarovi.pdfIn PDF document text
    • http://metabolit.ru/files/file/94795607402.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9fd4fe702c2e2bd538379ee349ad3edc/gupepururago.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/38302271926.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/gokewe.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/29078351965.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/suvel.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/wanosekimuvarekulisuzap.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/48100281684.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pb90ioal9hr5rv9rppmj2fgfp9/211793007.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bfad04f0---woxapojoneseduvubagesoxo.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/21503756942.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210817160545.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/deluzebapigelori.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/4340914827.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/944e60bf1205450c1de703e87e0be65a/pejizoseku.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_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 16620 bytes
SHA-256: 23254e916d794b67e431569c75b29e3107cda1ecef5e99bfe01a4941479a35f1
font_01_sfnt_off0001372d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F44 10440 bytes
SHA-256: 032e971127b05ad9e445d2b4d8f87c3c5803e9177f320690170307857764539f

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