Malicious PDF — malware analysis report

Static analysis result for SHA-256 105a3f12ee958b21…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 17:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f6d7cfbae092d8495d7f3867e3770b1 SHA-1: 104c2bb91b809804edeffbd8725accb9bd4907ed SHA-256: 105a3f12ee958b214fb6df1c2fdd7cf1372628429e9da22115ccd13b739d459a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and exhibits multiple heuristics indicating malicious intent, including links to algorithmically-generated URLs and compromised CMS upload storage. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=principal+parts+of+regular+verbs+worksheets PDF link annotation
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/92616778362.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/mimobexasutikuliwamug.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210628014827_njh8ry.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/86c197d2c2601c5c66a7907b6298d6f0/waxabulixinali.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/fasab.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/92422368852.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd399558c18---wefanulubelidupawatubaj.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/75435914450.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/43140518293.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f7ef2618e39e70ee6256d9bb92daeb57/josar.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/28586399649.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gaxadogezake.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/jitefi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/fbf6c89e49ada9643eedc8fc93da4c70/tobapope.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/31593432622.pdfIn PDF document text
    • http://ymmicro.com/files/files/51292152400.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/tepogiwimevep.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/18542654985.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5545887557---90375049257.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16102e080be11c---raxuzexifofubix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbb18d99d4---33819569074.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ecaf8ccd3e3cf990e5d675508fcc080c/piranefufazuferemamefud.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/10432768144.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/dbc151b604661eba7be1a570446db5b8/47973950220.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071702f3f95b---wuguladol.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7sv85r2s46lgtk22a903bsl8v6/97307033861.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/mebejawejamolupavobunajob.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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 18520 bytes
SHA-256: 2a489b2842ea9d046c8215f2f17c5c2030bca21403910413aaddbe27b8ddab68
font_01_sfnt_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 11244 bytes
SHA-256: 3350ed664a77e593bd8fa0f0543678716f13c4994189c8a17241ed70af0f941c

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