Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea7443d080426a2…

MALICIOUS

PDF

90.0 KB Created: 2021-07-19 08:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de85a7682b7ce456b52683c1c07b6b1c SHA-1: fcd5edf2a6435eed3712b8f1185021d91ba11b8a SHA-256: 1ea7443d080426a295d3a81a45cd7dd15c58cd86599ff5d1b23e7ce8aac41132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites used for file hosting. The presence of a link farm on disposable hosting and the use of compromised CMS upload storage suggest an attempt to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609c904feea9d---bizami.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711848c8e7c---86066020188.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/82ffdea658f234992daf5bbaf0bb7a41/16162304029.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/gomomulifisajadetik.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608242efe9248---kefimuxexodo.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2c1195f0c6d1dbdf18ca156156fefdb8/96304418017.pdfIn PDF document text
    • https://petala.gr/userfiles/file/35954146149.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/16e92d1851e3a89ef0141846e2030634/vudorulebijixalumagiguz.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdb147be8---kupatupitasuvibuv.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gosatijixuwevozobisukaten.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/valojegebezunem.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608251c5491ec---10101996560.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/39392321849.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f38d9196d6d8a9111b9156ca6d0a4f0/94301870421.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/71fhhp09vqdv7m9ea35lq0ogie/72278605628.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zeluzotuv.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/d4e520b66dd17faf422d4b2df3124128/sifibosu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/97eba21e760f91df993a695eacb5598a/80436748492.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5c3a292e---33345961513.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802051e1f6---wopimedojidosijekexereme.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/7d0e53fed4e40ba3b64a40c539b6edc2/94369683954.pdfIn PDF document text
    • http://topas.lt/userfiles/file/57250484470.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/nuvijadotedisomirix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=family+of+curves+formulasPDF link annotation
    • 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_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 17816 bytes
SHA-256: 8d584f6f91480b81508d753ffbb05aa96a9527242a542fb0c5acf7ab5ca9e545
font_02_sfnt_off000142af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AF 10552 bytes
SHA-256: bcb60731fd9354cfaa59fcfd3c463db37a639e504dc65f9c3adb20764412b087

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