Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca77b4577c719a71…

MALICIOUS

PDF

96.1 KB Created: 2021-09-18 02:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85046cc85e78bef5881424bc668fa62a SHA-1: 359e1c4f34e8baa86c9260f1fa590dec6cef8cbc SHA-256: ca77b4577c719a71491328e874ff2be1ea8080849433545fabf6defaf883a02c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://drafthe.ru/uplcv?utm_term=how+to+check+instagram+profile+without+follow PDF link annotation
    • http://pomocnaukowa.net/Upload/file/ritedebawes.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/06020307dc97f5e84231e70657120c52/tepodiwiwugirejilito.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/26462647843.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d3374688---fitudaruluv.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/rawalusorepa.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/73995622388.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/disisamurujejizumuzoni.pdfIn PDF document text
    • http://oris-am.com/editor_up/kejomubus.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/5325416476.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/4674989093.pdfIn PDF document text
    • https://tsegypt.com/file/85368646533.pdfIn PDF document text
    • http://stromzeleny.cz/file/ravagupetezak.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/sedunikigoma.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/58115582254.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/tudul.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210911224741.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7d328f8f---zodobe.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42304955616.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/8049015460.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e1c8b86c1e694779ebc42e15b3f12dc/terumaxedexonemivuxo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3ba0e101---13217542233.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/8119969087.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/96915368355.pdfIn PDF document text
    • 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_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 11196 bytes
SHA-256: 6d7fcd222895c95cbbaaf44036d268dfff896d45f10626852aa595c67f79689c
font_01_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001419f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419F 18720 bytes
SHA-256: be6a311dca2793b02a9ce8da28377090202661b0481a768be3309093d1151be7