Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e22a839ef56613…

MALICIOUS

PDF

93.0 KB Created: 2021-09-04 19:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23dad488dca8b2dba3f039945aa48718 SHA-1: 64aee9d2f088d5420144147810ce3d297a6ddd16 SHA-256: b5e22a839ef566130ea8e212d72f836e1e7802e59804ae61b39fc5b7b5700846
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or disposable, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to distribute further malicious content. No scripts were extracted, and the document body was unreadable binary data.

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://fentesmakina.com/paket/upload/files/piparibinosatugujozodapuj.pdf In PDF document text
    • http://hrzservices.com/uploadfiles/file/biwufo.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/19343220704.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/h0gldu7ic1aam5vll0javvgla7/9019848896.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/febazopajevogi.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/vijebasatisazoro.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/fopeg.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7c5fe6017---girojabixumubalobemunujo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/gebuxenulij.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ravetedovekixo.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/74788724443.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3a52c351b820251560b68d8e6840e42f/xuvovuxozeviz.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109316967077---zoxezodekabaginef.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b3d151b5c---22641082901.pdfIn PDF document text
    • https://chptravel.ir/data/file/43479496223.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/jivivigepofod.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/51069251173.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16112504bc0a60---56641549888.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gelovesufakivotazafuj.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddb355d5d---43215170387.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sebegej.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jisejafopafujigapewekeki.pdfIn PDF document text
    • http://psfund.org/public/uploads/files/cms_files/26221872901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=basic+dominoes+rules+pdfPDF 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_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 18428 bytes
SHA-256: a9ad0873c620275514c228e7cfa5d32b853287a16276ec1414205da266570902
font_02_sfnt_off00014d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D78 10836 bytes
SHA-256: 864f0bac14b016ff2735899e5a4d861f643381e36ecb8298f9f2f281384f404c

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