Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b498bdd14a24684…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 13:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d7fa1e299491d8941d100defe0349ec SHA-1: f3a97d9a0ee4c55c81216aab52755e4176d0bec9 SHA-256: 7b498bdd14a24684c7fae99925831d38299657033d0546554c47199f3028a6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, exhibiting characteristics of a phishing campaign. It contains a large number of embedded links, many of which point to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2a6e954b---rovupusebowadezen.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9c5b0ed6acf3ddffbf8a1fff51d61722/dinabojagemalusesebumunur.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/jileguvole.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vokuzanejaroxapimiza.pdfIn PDF document text
    • http://prestopc.it/upload/file/kepesifasavamipuren.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/dawufe.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dnie2acd962apiebuk8rgt2fsr/79589240827.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/luvitu.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/69452308380.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/tiliteto.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/8203596134.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xinojojeta.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/45028023647.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/75410411727.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/13198371001.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9938b0c5e---27070145293.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/83791000682.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cs44vo5ev1i4pdopcf9qf8hjm4/nebisibubul.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/19597978177.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/77395171769.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/gatigopekovawaj.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/38294375253.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tozekiguvotufikugebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=get+free+primogems+genshin+impactPDF 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_off0000c755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC755 10920 bytes
SHA-256: 55150e91fb281edc67a9abc513f6a186f1ed857042e5f699da4aa224e124e5cd
font_01_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 17808 bytes
SHA-256: 7295d3270b4f441a7635a071c5243cbd232299916d26db7cd1bb06b11ff587dd
font_02_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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