Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb456d677db885a…

MALICIOUS

PDF

75.7 KB Created: 2021-08-28 04:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2ab98eb69fa973ac8d156fff356dc48e SHA-1: d4b9b00aba70fc53222cb7f025dff93d4deb5ba4 SHA-256: adb456d677db885a975dea4b81bfbe9de97833c9c49c6dbd13c3744b36fc7172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to lure users to phishing or malware-hosting sites, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=you+buy+we+fry+on+livernois PDF link annotation
    • http://plafondchauffant.fr//img/user/file/82481683456.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f22c74346---naxebokalikuger.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/91162961595.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103149129a0e---nezotal.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f212c2a6aa---68276113712.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/65932266120.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xuwunizudakorifiduvis.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/fifudatujosiniwukemadiju.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8da0cdca5---77786754951.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/355d7fb36a11630c65e42d4860b25a69/fugidunepoxoj.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627596188.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/diraxazozusofupubemi.pdfIn PDF document text
    • http://fitviewer.de/files/file/47750329986.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/seripag.pdfIn PDF document text
    • http://scarpatti.com/files/71630190871.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3rlu54augc4jeb2fnoeobo33rd/97726395531.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/lejetebaxixalexosawov.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-4/20210604213630683753.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a60e3beff149996b3bd1ab181de175e0/waginadekoj.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce111c5c39---32708079610.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/xenetubadovemesibe.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160815accedcbb---xivoniroza.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d40d499dcbe433fedf7b4d2596bbad92/wuduxilu.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_off0000c300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 17108 bytes
SHA-256: 8d9eb9260f00cfab14d437b603a9dfb7c9659519ad70be051156711ff4fe669b
font_01_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10436 bytes
SHA-256: fbf610c4e8601207c0c1318d3d7b4f3d604fd1847ab9b3abb70e732d73a4697c
font_02_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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