Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28a8f931b0d2608…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 11:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8fc594540fc4434f430423260c79d25 SHA-1: 2e80968623a3db00b6eded2e814a8a7b8f879c4f SHA-256: e28a8f931b0d2608aecd8e5e44cdc100cb27a3ea2e7eac03006dc7f8416c2d63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs and link farm structure strongly suggest an attempt to lure users to external malicious sites.

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://deepankarbasu.com/FCKeditor/file/70670089862.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb65fc3fcd---lagosozonajafow.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077982c9afdd---sufukoraluxiwuxopudujomif.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/96869793253.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/zutobonu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081971404320---sosezezu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06ab80813---73121509992.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d80ee5b55f3cd100c238024aa090f570/44365772034.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/30676031632.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d477ca061a0---28977657070.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9e49e5f5---peduvuv.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/61288884488.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/absl31deag6p3ntm6tqm4fre87/61010852536.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a59d313af---daxobutadukiv.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/015f8c5c5fc134c962664541275e5800/remajakumerejuvi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d867be0af87---68818033060.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/47800501037.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/lunal.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a38c9c1f0931eb38111c447ea4ef1075/mudoxuvibuturekomirifige.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b281529---47498279440.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e948939e008e1e6b59fbf0c648123ba6/75355247877.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bf6475c7---vokepokapudigoloruvupuren.pdfIn PDF document text
    • https://coluer.ir/documents/file/rakuxujigiwiwizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+does+it+mean+if+you+get+nauseous+after+eatingPDF 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_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10964 bytes
SHA-256: 30d4b3ada2381bcee9be83349dd0b1444adecc71b34f0d39a7ef935f7307779c
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 16480 bytes
SHA-256: b7c12ac8a66753a4193ba54c05e5035d87f599b6c7252b55c60b152ef77d35aa
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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