Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a5de022cb8f316…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 12:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37cc56de1e783be8e8b7ba7cbbdd7c36 SHA-1: 9c7aaca2df2927fd5e5395fe8385c5dc7e87e9b0 SHA-256: d5a5de022cb8f31676d50f0ce66a406554c4bd29b23c32b8253bd5fa5668ca24
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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 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://pwr-tech.ru/userfiles/file/dewibusuxuvafadosumabuguz.pdf In PDF document text
    • https://ceral.pl/ceral/pliki/file/91728047448.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/loq6gl2sl29k1dprhbjrekac49/46001740693.pdfIn PDF document text
    • http://wawa757.com/uploads/files/kujaxuxazajimozoburu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7411bb275b28ee8aec573dabe543063b/44057602587.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r9qoem750cib2h72faa97i53nl/56023193753.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6cc220510---57227435741.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/65333755190.pdfIn PDF document text
    • http://isgsrl.it/images/file/woligopavewimozubusud.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/44717135343.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/gosexutoxi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/wuximolunadupeg.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb82bfe46---xulitej.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e05a6887---5873762673.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6af92286---96099755314.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d38d2cba5---15914334555.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/25536815565.pdfIn PDF document text
    • http://ezibra.pl/upload//file/21066673337.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ptu6bvhg5klmmodnfqffbmka2/49549538177.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/51ea57d9dfdb59fa8d66440242f8dc3c/bitekekogolujimakavolosaf.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c04afc0bb7d2264af647f9147ed69447/21508240583.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/be08bd4ee4ee0da78f0178a449cf3743/zupotamo.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/edf72e32c41adde69ee4b85bc86f07bb/xapumupefatamojilimos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+art+of+the+start+by+guy+kawasaki+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_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 17196 bytes
SHA-256: 552e83f216ffefe7b01698b34fcf4da3a24c25388836ab1f192c9d3b74a57b7d
font_02_sfnt_off00013877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13877 11124 bytes
SHA-256: 3451f51def7df2dcc70673a60150c9697ebc5dc6a5ac6387a2901a0bd3d16113

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