Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3812a68e59f833b…

MALICIOUS

PDF

140.5 KB Created: 2021-07-24 11:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 436e263248dd26cd6270e3b74ad7f266 SHA-1: 0c99426c4fcf33370127502cf9b1b5ea6093914c SHA-256: a3812a68e59f833b7679dbc171339123b04f024e3506deeb3e46f2f9d22a67e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://xn--eyt274i.com/upload/files/bunarivemovaduv.pdf In PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/50347725665.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e479459275---68838106499.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/buwijozufanazanidaxobawi.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/74883631072.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/93170845809.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/29675567095.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/i29544ain1k8luf6jjno12nff5/79395119151.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c9e36c6225b5fef331f565ab10249800/38253507179.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/73583266343.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a1fcae4a---40919127854.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/87416237418.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608504b403771---bevuzoludakudu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/40076589188.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210712221516.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/97200676504.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/tatepuwevijox.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081da979f8f2---51074942517.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a400ea73d19---63189322335.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3a6b7410055dc87d5baa2bafc594e981/71486614423.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c6a79a0bc---wipugavojusepujezimuzimi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607815744ab12---58728277126.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8a1b4962e31c78a42d662316b9980d92/84996490731.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1beaa6a79d795431145fda59b977ae1b/37102529245.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/51031021838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cuentos+de+ciencia+ficcion+cortos+para+adolescentes+de+terrorPDF 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_off0001c03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C03D 19220 bytes
SHA-256: 2c7c9f2e5534a87f3ae6eaa149902d53431fe9f3671e8807ce3db0a8f5ea165b
font_01_sfnt_off0001f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F166 10744 bytes
SHA-256: b24adc468ca558c543f43e66b162045e189ffb73bf10b449d99b60bef2e7d62d
font_02_sfnt_off00020a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1