Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f20ff1b7b413b5…

MALICIOUS

PDF

99.5 KB Created: 2021-08-12 15:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be6ecd177d5f870b7d210db539e19eb6 SHA-1: 86919d104228e5ba35831ff0e38d3f63d094ef58 SHA-256: f7f20ff1b7b413b52bd4d9b4d94ab246d0697260b2ffdefca595dda698a5b18d
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other external sites hosting PDF files. The presence of an IP address literal in a URI further suggests an attempt to bypass domain-based defenses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d60b0996797f80d6a3b6d44bfd41ea3a/81386882324.pdf In PDF document text
    • http://bagiez.com/userfiles/file/76272425287.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d308ae783---kodikabutogudo.pdfIn PDF document text
    • http://www.polni.si/Images/files/zonen.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/zowisisi.pdfPDF link annotation
    • http://arunimaflavours.com/userfiles/file/92470373910.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d7d058a72---92459134933.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/xolafepux.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/mosijijupixodesetini.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a866cea3fe2---taduvogijuzemetele.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/s0l2h50oj8t86qfiabphdhpr8p/62532118139.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/646f3245f69e4d086d23f06dd33849e4/56026513959.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/78083693019.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/durufote.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/ponamoxovuxifexo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160850c52782a1---1458303884.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/xakiliguviwojoxikela.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/vewemivigux.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/kobasozejovegegule.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/jivolukarusanuleje.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd3506aca---bulodupakubutim.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bodotuwun.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/rutodomiwujunulab.pdfIn PDF document text
    • https://webmenuplus.com/images/file/dulujabemudubujolen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tenses+worksheets+for+class+8+icsePDF 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_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A75 17220 bytes
SHA-256: b04a5fcb337545aa11b3a9afeda11945fb575ed967c6668b8ffd06ca5c3907cd
font_02_sfnt_off0001671f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1671F 10784 bytes
SHA-256: 5bb801e04d996d6f3915507f3be9a63f9543141a018f4a17b14c7efb8e2bdf99

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