Malicious PDF — malware analysis report

Static analysis result for SHA-256 90293820db6fc241…

MALICIOUS

PDF

91.3 KB Created: 2021-09-03 07:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a1514e73bffd8591b7f9a740bbe4c7f SHA-1: f0e0e2c100bb98a68604fd885b869cb381419076 SHA-256: 90293820db6fc241fe5e219f7a0894e5dd8eff22bbd843fa9dfb97ca1997bd57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d1ca5f6b7563bb6cca25955bfa22dc68/10009878957.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90de588d51---55724229407.pdfIn PDF document text
    • http://biomehl.com/images/content/files/26594158097.pdfIn PDF document text
    • http://josquin-capella.de/download/tovedavolesobedatefo.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/27832785521.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/kusijozubotetu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6vj5ogfnjol0sp8757vle2p3b1/43228387844.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/85598678614.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607187c90ac9c---36499402658.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3d8cad44dbec33431a663429c0c45148/69540188523.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/81046827761.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/virawaxodowawasipola.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/39124026451.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/88214193186.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/7317531955.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab276741a2---92990949431.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/85578414143.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/31958331373.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/xovixodexebekum.pdfIn PDF document text
    • http://envigest.cz/upload/file/vuwatutiloduko.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/bizorimafe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5527f539---zuwozoge.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/35143714473.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efa1e02b88---30781032840.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf706c5c06---9664783812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=aquatic+animals+information+for+project+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_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 17716 bytes
SHA-256: d551ffc1eb8a094643fb40d77a2522337549167e9c6c1311c23d1a4baf319c79
font_01_sfnt_off00012d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001457a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457A 11140 bytes
SHA-256: 6b1e5d24d57c631dd78d45f55fc59690438afa26e6c2561d8cd4882ee6ada537

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