Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7751071b84823fa…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 16:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a097a93d2482da9ce233f74508c86e62 SHA-1: baf70574ea3b53ceb957dcdc3ad81bab213f3d32 SHA-256: e7751071b84823fab7ee3a5183401bc9d2fe966dea2d4093d967c33888b4ceb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=get+rid+of+notifications+on+android PDF link annotation
    • https://eastmanllc.com/ckfinder/userfiles/files/72329472729.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/pulikagepima.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/razakijasag.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/18741799462.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a7718f289c19e7942e6f78ae6985ac46/sasepaxewitopijola.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/bifenixiwulomibupumupu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9cdeabbc0f8276a2e144ae6dab1bad83/tibezuwo.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/40592113909.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/junagixot.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/71688329169.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ragadetenizuxadalasi.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/70705028253.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/junivedezoxibu.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/gizaranipobuwebew.pdfIn PDF document text
    • https://naves.cz/res/file/14065693687.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e04a9868e29bacf35e569f2d8f8fe174/wipuxa.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c3454777feb01a59fd00949108e95c2f/wokubimebezojilexa.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/xodadefu.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/xopilusobekopuduxijogu.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/20798082740.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135836a33dad---2999567128.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/tomizaxonowilom.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/68578457070.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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 10464 bytes
SHA-256: 90b3d00846b619fbb2e5829f0bf4877e690c22bfa6a9a78760e014477edc3f13
font_02_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 17636 bytes
SHA-256: 07a9289635e78e4a1053db44fba14d71c05ba8e0d5aefa4b27a077c8a9f206be

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