Malicious PDF — malware analysis report

Static analysis result for SHA-256 2932232705657691…

MALICIOUS

PDF

93.7 KB Created: 2021-10-07 06:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0affcc69bd41133939e374787fb52fed SHA-1: aa919463dd44549ed9a45426595808952bd2a473 SHA-256: 293223270565769199f191937000bfc6826d6e2139bff152c3ef77adbda394aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's primary purpose is to trick users into believing they need a password to access an archive, likely a tactic to bypass security filters or to deliver a malicious payload disguised as a password-protected file. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=what+is+the+most+expensive+college+in+the+world PDF link annotation
    • https://fidelishospice.com/ckfinder/userfiles/files/gezavosatotejepesokaxud.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/56408706600.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/18225037137.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ba6c7e52036af14ba0f10976f241092d/73692354543.pdfIn PDF document text
    • http://offerparts.com/upload/files/jimag.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/13647328798.pdfIn PDF document text
    • http://geotersrl.it/file/57276241603.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/58608836382.pdfIn PDF document text
    • http://airzo.net/userData/board/file/36763470675.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/puvosebumaxewetaxarekivef.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/tasizaxuz.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/ferunuz.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161344841e1791---notibip.pdfIn PDF document text
    • http://artdental.hu/editor_up/suxonutaravexibik.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/nokuxinigisav.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/86369461944.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/44779100676.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jenotipajufin.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/92897843608.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/duwunigodot.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fc8591bdffe8b1e46236032ed0aaf454/pilegosamuxukubewinozi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1677d3d9e77c93e45335e030a0f9cf9c/92746004081.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/venozogeruwukamomam.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/27958086563.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9pltnfvuvmpjrhoemapft856ki/67727061533.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dtocd5ntjuq2jr1ianjr6lh5h2/zisipokumidekovasuwo.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_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 19436 bytes
SHA-256: f79622d58b07b3b4a83743f65e498130339f8a92b958dd88fb0b8f5d1d883532
font_01_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E97 11208 bytes
SHA-256: 433224d2708d6f0569be4e213089960ba4055de473188b1d34b083cc3acf4469

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