Malicious PDF — malware analysis report

Static analysis result for SHA-256 44172e3662fc17f1…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 04:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a9e0ecd0719b79b9d0921380484ec5e6 SHA-1: 092a746e7dc6f7724b378e1786d72ac806cb3132 SHA-256: 44172e3662fc17f19e3d63f0e1ce3103971c1d252f39a13c949e0432a6cb1342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URI heuristics and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=wrong+turn+2+dead+end+watch+online PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809173002c1---3855304978.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4238a2d5f0---60154587054.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5f1273ac8e247c04770f1f09255d8508/volizupowonujuloronejud.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/mabozat.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8535f6a3---89565546823.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/vigerivadumatosenoxireni.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210619214549.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8b608237---kepiruwomikivuketujij.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0ca47bc5dedaed35a6727d838dbc91cb/bitowepep.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/91757565536.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/90376191569.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9476d0abd---86245386984.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/95153170436.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f13b88d82c23dd9dc2cacd34dfba0b3/11398505204.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/55721840215.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3cnjjhegkid72gqukpfu2ri29u/vuvuvugoxonegut.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/47754723543.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609088883bbc1---piwafuvope.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/43650743361.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be298b22847---78711524544.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1e6c0c53f875954748be4f27bc6b7414/15987936250.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/tukorenikawixol.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/49265521867.pdfIn PDF document text
    • http://accronline.com/userfiles/file/zavudubaredaxotave.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/41116759262.pdfIn PDF document text
    • https://ancoraeducacion.com/images/79658915707.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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 10780 bytes
SHA-256: d459278cc0161699dd5193719f515d750a03b26c227b01c6bf076a27d68fdafe
font_01_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 17060 bytes
SHA-256: 8f140f176e49e699782778b94f7084b02eca2d451a79ef62eee59264947851f3