Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b55707bdb2f87e6…

MALICIOUS

PDF

99.5 KB Created: 2021-06-26 13:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7989f97e9538943adefd621c53c3d55a SHA-1: f791cc09d177c1d9029db456fab3ab5fad24ceb5 SHA-256: 3b55707bdb2f87e6fa7df50f5f6fb80f79e769d655a040c98b93911246de2fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for phishing or distributing further malware. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f4e3320e---gesegisekuxido.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/nb67gaektse9f65ag5hhjq6lat/wagikel.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be667d591b---bugovafivutuwawawiputiro.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d58e1cf0c---6027814337.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/zizavezokiwovusil.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a792aad3---pagufosukalawekutux.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c916dc8a31c---93985820886.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad9d011ad---16047226446.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/44013131257.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/49641414025.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/62669434626.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608719c957f8b---20057917056.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f1f9d71f0---moxezagorifebebuf.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tkp7bb7emfld2teessc8dutdhq/xipewilit.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc3b5fe50---sivufizojabuxi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1hbi2c7tk9v4r46naor9h2hgt4/98831827133.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfc82739a---13020846300.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/beruwovejigabedowodo.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/fawokopepafumejunix.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10a5d2bb3---6278944189.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/rilimijujobubuvusere.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c982257f1a0---womazogamujureju.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/mokuzimumorojulu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k9o096jq8ah01i8ohttmb40jpi/bajexudupag.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2c667c742d91d0bbfaea55ae5c561370/31867956940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=react+material+breakpointsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 10812 bytes
SHA-256: c7d846a8efc914db8b27d19f4b2fe943fe16be3952688f0f13cc8bf9516a3b23
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_03_sfnt_off00013e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 3692 bytes
SHA-256: bec3be9d671cb437c66bc68f8a8dcd3add22be44940623cb13932dc8cbe57657
font_04_sfnt_off00014cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC3 19344 bytes
SHA-256: 7f42116e35282e2f81e6c056a7e8288f06bbbb3b80af888521cbc4f9519fe7bf

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