Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d01ebc23c81521…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 23:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f18609b13196ac29ba312196e773f9e3 SHA-1: c8428df5e9ee0f8a8c7ae4d1bf63ddf95e701b0a SHA-256: a2d01ebc23c81521e32f6a68f7acc77638a54e7eaeaf8d5aa0d0dc03d56c2571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external URIs and links to compromised CMS uploads, suggesting it is designed to redirect users to malicious sites. The presence of embedded URLs and the link farm structure strongly indicate an attempt to lure users into clicking malicious links, likely as part of a phishing campaign or to download further payloads.

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://crysiq.ru/uplcv?utm_term=photoshop+change+size+of+layer PDF link annotation
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o2o40chvhmj364di16ejgrsbg2/musikewepop.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63bb3b4e---vimeputisojubofeme.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160783145dc9bd---binunalenorugep.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/829647832523f28dd42d6105e2275f1d/kagatevixoz.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4a29724138d338d73a0246a8a64d0532/3110001903.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/wowoxevive.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/28352588623.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/kikejiret.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e88787a22---23142470055.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/44630217494.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/94590277410.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4866f27bb---bisamab.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/13756894573.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wakinorogorepimikapu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097469213281---84798133762.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609719c848343---nedufizumep.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc40610a---12696697739.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f6205b132c2b874f25bccde62bdea80f/42875013772.pdfIn PDF document text
    • https://service-panev.com/userfiles/xopunuzezatumidefakomekip.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/11095943275.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/11krq47ufkmpqj7glh6981pnge/jofejuwev.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/vugozafemevezu.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/10575043039.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/13633651603.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/85362770467.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/865d664bb23aaf29b7a094207620e93c/gaxugatapojipan.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10932 bytes
SHA-256: 9cf32460b15d9360cf736b658ed26bc43bf4507a820851fb8a1077aaa6afaa74
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 17824 bytes
SHA-256: c936d097e91ad5607b39521cc087c0bfc8d27477b4a687a78e45a9e0c4885932
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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