Malicious PDF — malware analysis report

Static analysis result for SHA-256 65431cf1aba74265…

MALICIOUS

PDF

88.0 KB Created: 2021-08-18 01:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b2983af3c6dac8a22d55c4d8895fa75 SHA-1: 15c7a21a503bfb9adbe26745960a60c57f8a3011 SHA-256: 65431cf1aba74265cbb2c049a0dbe7872d1832df312a23d7304d76f4c72ba30a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ac8582fedea565f329dc16ddfb4dd732/pevizipunasolugi.pdf In PDF document text
    • http://saothienemb.com/uploads/images/files/fenofowukudari.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609832891470a---9798383258.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/28983e57c6e669f7781c39a8a66350fb/27817127635.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/81343251561.pdfIn PDF document text
    • http://gibisch.org/files/files/lerizozesujebu.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/76968568263.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a708431e46.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/wuroriza.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608777d60f932---64315940023.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/zedoxuwi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/romeregovofina.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4cc6517659ba280eb6d3b59245cf873a/jatinifolazojujepobubami.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b56243cf15f---65526179865.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ht6ne92k3mi4o9diu09sones11/zipiwoxelexizexujivilozif.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/zojaserotadeduxi.pdfIn PDF document text
    • https://ivaco.it/file/94980639151.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/zeromojola.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/39393385261.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/57696354587.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1371b065e8944db42529ed939d56063e/22485034647.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3f17968e648dc9861664f8a515fd55be/bikefeli.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92400b95a---sagiwojosad.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da65d2ce4b---jozonidideru.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/adaf5d37e455700e5db12e4bbaeba714/8660609339.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7f7d26d1---96489968953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=polis+siren+sesi+indir+mp3PDF 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_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 23408 bytes
SHA-256: a0d6721ba34e3f40c3c20f01ee7a8027f141ff5691955c2e63af1d6c99af09aa
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 17392 bytes
SHA-256: c24e56a46e4315bdfe52692c7ca06002cc4c475941ad398c895e758b298bc168
font_03_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 10468 bytes
SHA-256: b2a1499b2dfacab38da08026284eb88df8e80befebaee7a1897a81cf0e477a0d