Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8d32a202041e5b…

MALICIOUS

PDF

156.7 KB Created: 2021-06-26 00:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70129c95323ce7633e029e7f27bf3d86 SHA-1: f5cdef110c2cd6689d85fdc5d8ccfcf3abcf8f21 SHA-256: cd8d32a202041e5b69a818aaf9dc49b4463149353dda2dbdd8b013e2910a95aa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9288

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=simple+smiley+face+text PDF link annotation
    • http://dolphinegypt.net/userfiles/file/gagenokejoputamakotijag.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/94d67b002136af43eb92b948a387df7f/velik.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/frm0s64aibe03nq0glqj0j1jhb/kuzasiguxobedizo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/faraxegeto.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/dijanuminivodar.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/27580890915.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/16941642560.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/80812370895.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/863954f56e31bcd751b6441290356810/68818583703.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2ace94fcd7bac9b65f3fff50de1ed915/13132575704.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/o14k87bujg59mol0dfop50ibib/jawavatapuzerokuwaduka.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/o7vjk4gh94hu25cmlj2uqccsl7/tibiminemoxugadavisixoniw.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/7ui091eaqju6lskg8projoots0/tosokojiwudafife.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/74a72ebaf2e21f1080fa29321bc8ba18/52317154103.pdfIn PDF document text
    • https://tepihtrava.rs//files/323034590.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d3283701c72ce7813e6ee622cafef50b/wikonexapixa.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/4420840659.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1f21f5ef44299e3cc82f2a97ab3c3d2c/41970378456.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076037bf114d---7101658167.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ff49079e71bdac3e9ab741e92b7673a/venetuk.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/02cbda22372f2721cf7f0fca8fdd4748/fokamotivok.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0b7dc5ed8627aaeb91b206ace979bd99/sazixi.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210607_021818.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 30228 bytes
SHA-256: 630cb96848dc99e6ccda8a8b79f436320b35d106cb8c224ca0ce468a4408f025
font_01_sfnt_off00016333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B44 82368 bytes
SHA-256: 71cd4c83c09debe25fa8e396c5d4eaea7b4466a6e72658407051ef3843e1aaab
font_03_sfnt_off00021b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B85 7836 bytes
SHA-256: b99e4b611845aa4ee3aa407d6933d439ac99f9551cd9b3465e0289bb498e2d3c
font_04_sfnt_off00023738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23738 9636 bytes
SHA-256: b330f832c2b04a2600147c600789e1cc4c7b6e1b50307189f2663c480b49c6de
font_05_sfnt_off00024bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BD9 10608 bytes
SHA-256: 651762226ba32533ca5dab539397d9c2ba90960a29fbe5c97174c28f0f9e4618

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