Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d82cccd91aa67c9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa1e7579b911362e25251dfd152e7baf SHA-1: b5efb6692857ed45fe149a0d8ff36e153fa405ca SHA-256: 4d82cccd91aa67c97d077a82adb3caa02dd3a7fbe6fbafddfc5248f28de9d83e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://eobliecky.sk/userfiles/file/60646210889.pdf In PDF document text
    • https://bustotoronto.com/userfiles/file/59877637001.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/degupir.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/94108383425.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/30130534557.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/22126784954.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/jutoduradov.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3916efa35---11338468075.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/15359559057.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210525/file/16219262803827.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ecd7311d33f6566ae7fd9c948950ad75/ludebafapitagawusuw.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/77031847294.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625573883.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/5itipac8f8gfj3rsqd3g49li5d/99298082567.pdfIn PDF document text
    • https://anakmeong.com/contents/files/37105120105.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/kosopis.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jinebekanosojixa.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e946bb563---loranudedegidevisuvivas.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd6f72442---zafufakoxiz.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/kevatekexadisute.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b603619c22d---jejunojokinosetezoxoji.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacc694df2---73702250571.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/99069306234.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sq0f1jr955e0qvdtdr0e4oc7e6/17138523239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=american+housewife+streaming+vfPDF 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_off0000bee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 16580 bytes
SHA-256: 22b557701fcf76be9384f7da32ee76d9b794e739d95af880b7e22c20f180929e
font_02_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10968 bytes
SHA-256: 421c82424b75af37dbaa378b72458ac04111a845d3c8a2dae55b1cdf5bf60691

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