Malicious PDF — malware analysis report

Static analysis result for SHA-256 5776b50288b6822b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 09:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 448a2d7aa9721df5f8a29d640b56d629 SHA-1: 4775a23981ec0642d14b031ec76e462eda5f26c2 SHA-256: 5776b50288b6822b7f207abc2d23a5f2785d3ec97bdc629058250b5e85f3f1c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of 'career coaching pdf' in a URL indicates a lure to attract victims. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=career+coaching+pdf PDF link annotation
    • http://ecogestval.com/userfiles/file/fekupoxagosamafaxonumol.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/61476738185.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/55802846712.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/27894392683.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a3c7096bd61967048b9c8c47da38921d/45373259252.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0a84a184---jobefawabiwopujike.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc120099c---sinekuzuzogonenuzoripobo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128ed86db746---topezuzevoxuwigasav.pdfIn PDF document text
    • https://pubgpin.com/calisma2/files/uploads/57259966692.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6248a6d0e6b1c16657bc7e3351728921/doxaverafawafuwoluwowoda.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cd4e5ebfa6322841ed30aa56f85c1adb/85524552376.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ba3vor219r5qfd41jijphhckr5/98591521700.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608242b9d2b63---faxefafabewinu.pdfIn PDF document text
    • http://ducnhua.com/upload/files/zikojukalapunijeje.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/f388bd69cf97d64e488c8031f0670d05/rabajusubefibidezakolafu.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/16797430629.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/60928387743.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gdq84g5i63mgpfssh31mibtlr8/tojesexegiro.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/79628475205.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd7c8146b---51049007325.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/65965466837.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c38009db7f5---59021239463.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/60133931357.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50f767d08---nuzufetukabajevivexipok.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e561cf1926587e4a08c749c5393435b0/53396798674.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/luvejoxuvuwiziv.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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 17932 bytes
SHA-256: 287104a28c6997b19846b8607bd0e135724c2505f094553d2d9953c7fdb2016d
font_01_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 10616 bytes
SHA-256: 9fe43329296709f93d83182a0cdbfef6192522dd2cd93e95e3ff14dd60de5a9d

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