Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dd46fa5475ff9e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 23:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14175f7b62bb2faeb7830c0d97128205 SHA-1: d6b2a70984a8374f6a1763328fd34a831553f911 SHA-256: 40dd46fa5475ff9e99da563f1fd7cb32f4e3326fdcaccbaff6a73ed5e8a987b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing lures or redirecting users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to compromised WordPress uploads or other disposable hosting, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=garry%27s+mod+on+mobile PDF link annotation
    • http://apexnepaltravel.com/userfiles/file/85959897065.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/suwovezawofanunitikobolo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/milapirufipudi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139842c631ad---zaxaraze.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/77479363394.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/dugapivaborikowexibuzev.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/figiz.pdfIn PDF document text
    • https://signika.pl/Upload/file/70664223536.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/99808832119.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/pikosizalizasaguwi.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109112133226263.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95cab4857---67932501532.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/97057698989.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/044bce41fbbda4a61d55ed503a44a4a2/mipazuwinonakidilutogavu.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/lazulelufepidoxix.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/nekazer.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///87949560072.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/20177366871.pdfIn PDF document text
    • http://dogable.de/userfiles/file/16384034225.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210907_A2CC9F4738FF6BFB.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/86872363924.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/wugulomubam.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/35152654728.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_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 17936 bytes
SHA-256: 7e040262ed4fc01e6770b79d091ace6ba4100afe567d5265b1c1c33303a78fa0
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 10640 bytes
SHA-256: a5600c2e81dc6419333ee65e8c9e8a6f423109ad1d13fc384a0aeac75c6276f0

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