Malicious PDF — malware analysis report

Static analysis result for SHA-256 58abfc3374635a15…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 10:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73d74da4919e1a319243ee8b173eafb7 SHA-1: ea6e43210817bbbc4bf58df5315a99e2b0169995 SHA-256: 58abfc3374635a15cb91cd77d0147ee80c0db67ebd1c82fe2c70429810c0135f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, some of which are identified as potentially compromised CMS uploads. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://texigo.tw/upfile/files/2021/09/02/lobarinowubu.pdf In PDF document text
    • https://afma.pt/site/upload/file/7173285241.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/57676949222.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/36871016011.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fomav.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/98784880933.pdfIn PDF document text
    • https://doitoutdoorz.com/file/3GDkfFXWpVCQqDzm.pdfIn PDF document text
    • https://network-italia.it/file/mojodujotibatamakin.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/h9vs18qfgo56tbaod2mcu2adg0/dapidamap.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6f2e4027---58398861812.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/wunuroteteniwexaz.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/sunepife.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/vuziban.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/4044052437.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/27875169688.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ok1hu0fjlla41ddvcem094jgb4/75346852059.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/58088781378.pdfPDF link annotation
    • http://yokohama-model.com/userfiles/files/14371410616.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/83040011637.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/a9ldt140vjm9pabm7k3one7dsf/57435909336.pdfIn PDF document text
    • https://emenu.hu/editor_up/mezawev.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/2613514622.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/19934317282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+see+wifi+password+on+my+phonePDF 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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 10808 bytes
SHA-256: 809c1e776b633b2561b600b263f1bfa3a7759bfa22dc89d387a0c8698a564fed
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 18020 bytes
SHA-256: f3417a0f6cdf37c7eab0d3485e8c9d9adcdb4e33e03e3825080a26149838909b
font_02_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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