Malicious PDF — malware analysis report

Static analysis result for SHA-256 112462b2e539f372…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 20:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2e3cf00d1dc04e63a152780b5a601ea SHA-1: 1a6194be8c0e1621bab0e5a924a4135edf985547 SHA-256: 112462b2e539f372850649bfe9ce348503c6ea3cccd986d3ba4d3d7072dcce5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the nature of the links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://chcial.ru/uplcv?utm_term=resiliencia+psicologia+pdf PDF link annotation
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/nifudonelasaxefusakinesip.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/fozavajesunofabitiw.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e3358cb97---jizibetagat.pdfIn PDF document text
    • http://dentherapia.hu/files/file/22365703614.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n58v7neccoqg7dgnrb2nb7uvbs/gisosog.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/29137807245.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4fe7e04b7c9727205b459aebb1405edb/novivupokala.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b224fc66c7a---82845878195.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/54656213588.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709d68bf60---senezul.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/1004552490.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/45155313424.pdfIn PDF document text
    • https://rintrans.com/files/bajuzerenasuferos.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0cc9a8657a---40158683984.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/zegefoso.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610141249fc28---kaxekume.pdfIn PDF document text
    • http://nature-revive.org/files/file/fezapovolorex.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4c30937bf020ea36e41e373c1a146110/sovilefuxubizifewaxifene.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/16449502605.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/38721e78328bd2561bc2d72246fac0d2/segakidip.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/88f76f6891f05e78e9fdc50af7349b64/sefew.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/sukeresosa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kikumazurusa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1635b0fbea22551dba3436ef3f81e2be/venarojusenerasobedufivi.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/47627570609.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/53777074820.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_off0000c090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC090 10640 bytes
SHA-256: f5cf7a5389ce03b889e5eb12326680bf513e48c8369c0e9301da0fbb3510d40e
font_01_sfnt_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 15708 bytes
SHA-256: 67af436629c5a55c42e87c900de8fdce23e3426190437e9fe08b68a2cd3a4a33

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