Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7230224c5380f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 07:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 782e11bce385ab5673d674b868a840e2 SHA-1: 21d0311a31cdee48377400e691e2ae669eb25aba SHA-256: 19b7230224c5380f90156ad41181a0142231e6c894db759b249b9c3794d2ed61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://thayloilocnuoctaihanoi.net/upload/files/33628003606.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b36701643187b070c18091ff067d4890/futuj.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gagolofuraj.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/dewesamefigefep.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6aae261c1---34345891983.pdfIn PDF document text
    • http://www.pvvc.cz/files/39026630696.pdfIn PDF document text
    • https://silga.ca/userfiles/file/tukat.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/waboginon.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97243e1ebf---21569460851.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wiluxos.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5bc17e20---viwugomajirigatigij.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/9584281999.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/sidelutuja.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425f219952---48024679820.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/7062020549.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210606030751.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1cpogks4av299ful3h38ct1d61/godatujirizelujazisiduj.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612524c2c048c---10770337134.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/tizobifizivigepuketijafev.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/82603729533.pdfIn PDF document text
    • https://bauarch.bg/files/sigarenofiniwifekesoba.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/82011490907.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2a527e9a0e018d9912134506271c65ab/kolefulifenudizusad.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/38678684155.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8944e3f8---48048927252.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/74873018000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wondershare+pdfelement+ocr+plugin+crackPDF 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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 17720 bytes
SHA-256: c69ea83ece8d31ead53b167b6a75bf139de5305ccf1becacf8d5a4c250ef7f16
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 11252 bytes
SHA-256: 26b7e0739f4e74d646a684e677dcc3c5b61859478d772fdd37f14059e7e83712
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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