Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc7c23efbe2c85…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 12:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e54f6403ee119e59d8916c6754c42195 SHA-1: d5bf58a72eb304b1c3730cd9b3259b5f7b5e321e SHA-256: 7bfc7c23efbe2c859cc98e6d4aae466ea675dccbf0cbcdeb9f7734d7c1fc89a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads, suggesting it's designed to redirect users to potentially harmful content. The embedded URLs, while numerous, are primarily used to host what appear to be further malicious documents, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e443a6fb---24064693247.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a5245c12---kerelotozuve.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b152155dbb5---sonilofozujupufadozi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e74a5661---mixupu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc9622133d---57916432863.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lifilogapupusukuzife.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/renometetaju.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bimomoxorekazakij.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/31324576387.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/488a8b6856bfeca5e3d565b937d837b9/pemugomulitapi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5c08a474---pagoguwawunikobewo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/67080170865.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb4642ab3---61153366994.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1887ea6e---52459606863.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7bbec7a60c36a90622b2b5f66afc72d3/nipediviwinaxelarexumuj.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nelosodokokupise.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16086e58444c80---26412162946.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pivisamugi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d71e5a521---89668611706.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4129b78a---mopikedesixapodixobuk.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0459749d---35025130802.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/dufewoginavinesoxidekem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+hookers+on+gtaPDF 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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 10420 bytes
SHA-256: d1bc43ad9d3a128a229c6a1a6f493da91c3cf85e624936f9a15b2f79af775dea
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 17320 bytes
SHA-256: 0c485f3d6cbbe388229367b42c0e9d9f79c133bb153334391bc458341a806743

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