Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f52f0916e8c412b…

MALICIOUS

PDF

99.9 KB Created: 2021-07-03 03:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 435d25e96735c520cfd4459d4b568e91 SHA-1: 3c79704895559fd701b8d349b1d619c745b16699 SHA-256: 8f52f0916e8c412b770bd5f6b2e18d5b011dedd058a37d887437d6bc5eaac002
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://imi.vc/upload/files/rokaviros.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820dbd11413---33101465983.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/rujodilup.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gto79m9dp09dm0o54nkpddog6j/kulujigilimufise.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d29b2bcc---kavotanemagizaje.pdfIn PDF document text
    • https://latework.cz/soubory/robinokakanekuwiwetu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nelaribarujugus.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b91878af5---povuxijemaka.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h76o4d7302j6hnso28fv2ltt04/nuwojapufajelikonotamin.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c1ca0f98e6a91758b0e32125c7649bb4/kumimogarawepamez.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160783064b6cd9---furamamuxesixisusotemavib.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/2581015332.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9716f2824---46323958737.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9e34ac57---xefudev.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ohec0bp6ulq6uq8cn38ge2n51/76459302492.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/padufagim.pdfIn PDF document text
    • http://bjjiffy.com/upload/mogepapibawoluluvamo.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/4491596933.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b20acc4a2c87da5ff8620b5556c794b9/mizimawakanobakekematatov.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/sitirom.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210628232134035.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072480942d45---46377345824.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/disuziwupavijatexu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095f92fd7719---34641669645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=150+ecg+cases+5th+edition+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 11196 bytes
SHA-256: 6332c63f82535fbb8b900e6407d26b2d80b8f0a2abb9b8df56d8118c9937f8bc
font_02_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 16336 bytes
SHA-256: adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa
font_03_sfnt_off00015145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15145 18468 bytes
SHA-256: e6940604c5201770973e0d5db10c9b435b8d4ccbf24602476aa124b212f635fe

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