Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ceecf76e33ea20…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 08:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c9dd8fdb839e07d49594eab9025b0f1 SHA-1: 59213bd39fa5557ef75a0067d14ed0696136a12b SHA-256: 37ceecf76e33ea2066593f99bc0c750d039e2ce0c4e658c813d02bf8b6c5e74b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malicious content or phish for information. The presence of 'wkhtmltopdf' in the metadata suggests the PDF was generated by a tool, which can sometimes be used to obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=download+torrent+movies+online PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146a50dba79f---4278010743.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sataxezuvobejetalazixow.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/zapuvujixew.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/fesemilore.pdfIn PDF document text
    • http://paliukenas.lt/i/File/zarom.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/riforirezuraduvenegov.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2b4d8e91---1334049140.pdfIn PDF document text
    • https://labelmarket.pl/data/file/85855710942.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146723f8e257---rojifojegajubiduk.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/ziserox.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/bosidesotivozudowetara.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/90778460548.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lodal.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/kejipegaxoxatenep.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614192978bec2---xelupakidojazonewip.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/88271595834.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/42373110284.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/wanegomogesafamosatetepe.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/94534668522.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/82200176834.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/pasifakudo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145506d46ee8---zarasedi.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_off0000bba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA5 15600 bytes
SHA-256: 5a88cc8d446ead3afa9954b503fffb062a8d3d0d502c6566bfbbbc8c42adcd0a
font_01_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 10564 bytes
SHA-256: cc4c23ad19467e819404a26fb071b0ca68b998bd27baf9530e3342adf57d4d70

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