Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3be2668aa514df…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 08:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 468d9d5583219be5152982199aec7e64 SHA-1: 48306c425068446450f330bf7094252d67ba0dfc SHA-256: 8c3be2668aa514dfad55eb8399c1bee3909599fe990b0ceade9ee1969a4b9cb9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised CMS platforms, designed to lure users into downloading further malicious content. The presence of external URIs and the nature of the heuristics suggest it is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://avphunter.ro/ckfinder/userfiles/files/pipuselivikunulisekujowa.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a693e45a5a---62386762362.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0658cd311---zewilobexetedafeviridaved.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c73557098---davidiluwade.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5482ce24c---xotazilisapesizane.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ef099bcac5df81bb70c6b20d4d11dc44/fudizevuxomivumiwanus.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060813033973499.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/248e04128372b3dbc48df472673c5631/rixegizom.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea263efe3a---rivizatotufasusumarajelol.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/82vue49p3gqnmr0cmfrqbkbio6/voludajujaveduwifumogitum.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c4ba6a51---27257333777.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/28405767335.pdfIn PDF document text
    • http://cichanski.com/Upload/file/1528076265.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/69a57cdf4f568ea50b1243cfeb0b5157/62067119859.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/82535724587.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/26609349308.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/xopasipowaxariwotifeb.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/69d178f5561b6e170b0965101627c1a8/xesebumopiwawurudigobiza.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3ae831a0e43f16da6a0369a46f7fa81d/33166643068.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o78on0g6u4oso7a761f0pcgh95/nikelefibinigixozutu.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/26243987194.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/sasawufe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07dd6cdd8---famanugemabiza.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce62d2098---84194008721.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d21f13423---narosimakifedagerix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=functional+foods+and+nutraceuticals+pdfPDF link annotation
    • 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_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16624 bytes
SHA-256: f827afd5e86ff91b9cbcfd7932a7e649586bb0b3f6bde040945ea696b780f547
font_01_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 10688 bytes
SHA-256: 6efead0741c9cdc864c9b390361e91d6665ca2fda28edd40d56ed324d8ee805a
font_02_sfnt_off00013b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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