Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a32eb190640332…

MALICIOUS

PDF

82.6 KB Created: 2021-06-28 20:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff55107dd22845fbafdb9a6357cecc3b SHA-1: 1c9a428800aba02b9c43cbdaed168f777e043841 SHA-256: 53a32eb19064033272c7a1c4ee98b23a13012abe9c39680ad25a6c7c8a02e72f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The file contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly supports a phishing or initial access attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=cpr+15+to+2 PDF link annotation
    • http://rymwid-training.com/userfiles/file/45292841673.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1e98054fe27607cf89bdc7b1694f6ec6/62668918191.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27042116179.pdfIn PDF document text
    • http://vodnik48.ru/content/file/49010901708.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/91801971590.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/1282585756.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a97fea028---93962519404.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/donuredokowuxuju.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfa564ce3---goromadivugepawedimo.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kakekive.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092618336af6---goruxalunokovojizojeg.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160827fee0d56d---gorojogejalemarizos.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/20001883007.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608157a9ba9b4---vatagibesazuxamujik.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc00d3f3a1---5917714637.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/defisuzabizevisipix.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c8e3a7012adfea4af39858bdb5689490/revanulebufalurefivenuf.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ae7bccf19fdeed751f55fba7b3e9069d/gipevematujudevasadikub.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/caa8cce3a3418a30d98b9d16fd7704df/62438603219.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8490dd61be---vobijalerejudofixixali.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/63452770892.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807295a820c---35561340336.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281800195173.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/17190893329.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ef363b8f---51550426430.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/26967279760.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160780d186b65a---telewetodekijojesavobo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827fc90271d---21386220080.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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 16448 bytes
SHA-256: 1ecd0eb2b7e9434f3057eb43d1ca56adbbe0b7d3a5546ab6dd095f226b4dd2b9
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 9880 bytes
SHA-256: f9bb988f1f9388628f4d5eb515fefda2d6d1149061f57ae6e0835682a334fb0c

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