Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fed192efc341832…

MALICIOUS

PDF

88.5 KB Created: 2021-08-11 23:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8f093ffcf88d7a8cae6ac8a60cbd67b SHA-1: ef2c73957f79d5dfffdf76201b0a6fbd6032163d SHA-256: 5fed192efc341832baea6da6c6cf204282d9ef03158fa33385653cdeb329ccea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pistant.ru/uplcv?utm_term=jojo+siwa+whatsapp+number+2020+real PDF link annotation
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/dekosejatuwena.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f185092f4---vomifujibapovuf.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ld15ei4688n734mica6t6fg94p/39041205558.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210605091548.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/60083738904.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/71745686399.pdfIn PDF document text
    • http://sterkrade.net/ckfinder/userfiles/files/vonok.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100669a876a3---negige.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2713f0da9---83036822715.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hoilqrg82hmcps7ncoi81jlsa3/53112584668.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130f135a163---71904632373.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/32951e98fa7eb1e1864fc0e9f481be1f/56677522675.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a5f7e6cf---wifexik.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071304532373499.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/pifos.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/kfebgqj9vb71hbmn6vgcrfe254/xosuru.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/12349392895.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c35b5196ede2470062c9d34375b3d5a1/68703206975.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3f8852d5---kiniwekakezetanerevefilov.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/85320294891.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/75264671584.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/safogisete.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1e064egfiqjir2fiq7ofpqiot5/18869107980.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_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 17684 bytes
SHA-256: db2bcebc9d10d2d21bc89a8e2e34173047088717df9a4f440930035dcdf8bcb4
font_01_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 11204 bytes
SHA-256: ab561c7aa9be6a86cc85858b0071b05c24d02b294aaaf6f157ad013156ad9386
font_02_sfnt_off00013b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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