Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd71847273c451fd…

MALICIOUS

PDF

127.2 KB Created: 2021-09-02 07:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3f17374455ab340e1d6a06fded9fc1fe SHA-1: dc84aeb2f959cadfaea3b2b66f5846bc53692431 SHA-256: cd71847273c451fd30acf24ec7b7cf7b5b725f18a03a5fa1a2d2a8ffa4c5516c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous PDF links within the document strongly implies a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fidelishospice.com/ckfinder/userfiles/files/51655441998.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba755651459---40550222171.pdfIn PDF document text
    • http://otczenacts.com/media/files/zugefiregeli.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c00ad1d4db7ba785a32e1afaf86801bb/99089336769.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/lelorefamegazulelefepe.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/nobazatenamojomareze.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/14285239604.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee6a0ddee---fesepubixut.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3959d93f4beb76d01b42e32b4791b522/1983811503.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sobaxododapivuliviwuroda.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cdb84b86f1d59424ef0c53cd32c1563/20682921499.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/xowigeripitogiduxuj.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081694512912---zavunazumuzexev.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081da9671c1c---73368783750.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/30705696274.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5b3bf26c52b2df1d7e5eb986ef2ae1aa/juzazerefesivineme.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e79fe725ade277bb721ba2e9b9a5d3c0/19477947850.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073379e259a5---71806909348.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210702223641.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vekijepivaviget.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea2a35b8e1f949ffff9f40f75b7cc183/6006317353.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jelutisepiravaja.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/26456525899.pdfIn PDF document text
    • https://slide-bearing.com/d/files/nelisonopibudozokodataxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=traumatic+brain+injury+guidelines+2018PDF 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_off00018295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18295 21764 bytes
SHA-256: 15a3df178e09085b647976f6ebc918d11c8b5a260ce0af2dd04b224976ae9e61
font_01_sfnt_off0001ba2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA2C 11540 bytes
SHA-256: 6bc02e1e36a639a17c16d9b5b4620e93595afeb4110b9d978b87f7c68a546269
font_02_sfnt_off0001d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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