Malicious PDF — malware analysis report

Static analysis result for SHA-256 79354b77a85f1ac1…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 02:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 149b0afdc0a63fe4034fb9229f76e748 SHA-1: 4087bd525252ff2cffe27b2919e0ca88bad0ba06 SHA-256: 79354b77a85f1ac19ac578811406c2dcc9326992dff92e064cf52eba3822508e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://faw-asia.com/image/upload/files/kanelolunijasirix.pdf In PDF document text
    • http://wienbildarchiv.com/upload_files/files/66287129243.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/bolunuxevagalafemalozej.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/belukunigisarafifatuwepuz.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/46b69989f0e98634f73b6f9d3acdaab7/pezolatibolowupifetirozid.pdfIn PDF document text
    • https://ms02bet.com/contents/files/fowadajoxozibolumojeduw.pdfIn PDF document text
    • https://togeltop.net/contents/files/nixivopevozuzosa.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gowenapumatedazez.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3762f6969f81d0096252a26f5bdf9a52/dororiveninasosatu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d4727fcc---60467871686.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/o21o8e6lfl7hvqs0d3jmuslfnn/duvegaresikov.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/42f707ccca9fc0057881ba8b38342307/71963683713.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/39950342523.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • https://codecs.ro/images/file/rezaxokigumijikalasin.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/bokejabidibiwu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cb2a6c9d0---14981675939.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/vugurakefapuxunoj.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/24336440342.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/vusewopowufanesasude.pdfIn PDF document text
    • https://maturana.cl/upload/file/60795063943.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607184d2b94af---28418185088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=filehippo+pdf+to+word+converter+softwarePDF 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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 17756 bytes
SHA-256: 3dd78944ebac1dd137e7791c057b49d17f96efdf3850e1b9c27ec175a89bc4a7
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10844 bytes
SHA-256: 6be18a790b5a2032484503a61dfbb113f4102910db9d90ce49d04e2d35007f30
font_02_sfnt_off00012d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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