Malicious PDF — malware analysis report

Static analysis result for SHA-256 783fea1c27996c86…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 04:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb4467ca40449b5678885f458d9032a6 SHA-1: a778b382e34efab00db98f68aeadb9b257a8aca7 SHA-256: 783fea1c27996c86108de4ec673a50e2a75ba8a705e3bf751dfadfa296ec036b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or directly to IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://barcabianca.eu/upload/file/giridefawuger.pdf In PDF document text
    • https://epos.nu/ckfinder/userfiles/files/disogesaz.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/kemara.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/09jkl6eb9j7em5aqlq0civ0b75/ludexeburexemagu.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/vemamolafajobigara.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aeca68015ab---sulijezar.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/87011226532.pdfIn PDF document text
    • http://slsnn.ru/content/files/44529242776.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f5237b6eddfb99a4896877f8e3a078e3/48095419102.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/34712120443.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/93302095856.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/gisadotopifozupaleb.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/88781020513.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6c5d635a1b19f41df7b09c5440eebd25/92230874391.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/44180307974.pdfIn PDF document text
    • http://skia22.ru/pic/file/xopinawomipamojefokovono.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/zurid.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/89184138203.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899687ef7e---bogetagivuwo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/87127723534.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835c032e7a---widek.pdfPDF link annotation
    • http://studiocommercialedelpiano.it/userfiles/files/petowigiruxexededuxagazuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ncert+books+pdf+class+11+mathematicsPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/guruzulel.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_off0000bfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 11044 bytes
SHA-256: 77637e1d91770cef3b86a983e0c19fcb21bb484e7128fb2dac7b9c2f1e7a8b83
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 17100 bytes
SHA-256: 241db576e945f7c0f913109ba094e32d566d832bc2739f6499878e0bf711a392
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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