Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8e821fb923fa04…

MALICIOUS

PDF

97.8 KB Created: 2021-09-12 04:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b15cade971ef475853e7fe7a5b114047 SHA-1: 49be0d30388ab9c5062c18d7989726123fa3d3eb SHA-256: 4a8e821fb923fa04b38d74c1ff0d8a0284d900ade4a7c3f39d54cf393a131926
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised websites and includes a deceptive download button lure. The PDF's structure and embedded links suggest it is designed to trick users into downloading a secondary payload, likely hosted on one of the compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elitacasa.it/images/file/83698635247.pdf In PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/vovapakusas.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jixuwato.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sr17lenikupces1hcek8nee8rn/fojaniwososupiwumutugexa.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/54373526941.pdfIn PDF document text
    • http://chenruichem.com/upload/files/7796810766.pdfIn PDF document text
    • https://jurad.eu/files/file/94757567775.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/jijebofoke.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/katiteneziriwuludelexu.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/jegupizopinefotesanara.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/lebonenibidupimozor.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210909/files/20210909082152.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/21766618877.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizobon.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1c9e80ad12da1dda55073884787b77ac/jozobobudezez.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/17327436886.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/29714139523.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4485cb46---64937653804.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/joxopanojebisafenu.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/jemijes.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/fuxamafelaxatal.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/mexuwodapabosa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8ejj04r2v0i9dfsgttu04cnluv/mujawikavuvivunawobus.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/44716663258.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/wapofimam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=movcy+movies+free+downloadPDF 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_off00011b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 17460 bytes
SHA-256: 803c5613c770118e8e2af0cd3c74a6eb4f8c6bb7f3a5c8e4bbed36712ec5379a
font_01_sfnt_off000148ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BA 10800 bytes
SHA-256: be19d81deedc7b64d840fe0b2176b4b2cd343817bce377d81012db11e34f64e7
font_02_sfnt_off000161a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1