Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f425b3c65a90d3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 21:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 662a4a6ffd54b47e36f49a709e7b6856 SHA-1: 52185295fdaa0cb73f33f53c738f3cf718e6db3c SHA-256: 95f425b3c65a90d3f24de7d140954f64c802af9cdf14f7b8040c628841ee5fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=good+thoughts+in+english+pdf+download PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beb76572733---25999866390.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e12e01bf1---degebiwotipupar.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/zifibifap.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0d676cbbaeb163181d2cdbb10e03b9a1/8829124042.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/xotatumologaponoxo.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/98453505407.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/sigepadufesitoj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b733ae162---99468667227.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d899593861eb799068a8282287c64514/25569873274.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b8e54ed5---14408121836.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/71110928168.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/botosovoledulowalogogof.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc17d29ee2---dewudodofofatonawor.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a70f25b81---58864595954.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/zikam.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/51374949849.pdfIn PDF document text
    • http://unsersohn.com/images/file/jutatizudelitubujo.pdfIn PDF document text
    • https://alutat.com/data/file/burefus.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9a56a1a734a1b04375398d60d74be9be/26237879930.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/38047365423.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/28385600808.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/fokegimebaruletugufa.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bfce55d2f90ff4f559b501de33b3681/80641033873.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b407574de7---vanubeponikafulu.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/22895641340.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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 16988 bytes
SHA-256: 004509a7b1cd6a472a2f603530f59630349b5f541db51a67be4b6fa80cb52eeb
font_02_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 10904 bytes
SHA-256: 0b0175c5d979e24b9a05331985644e8c9f18a87e1e5e6aeaef40e6f20ac7e685

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