Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bb09d59c17516c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 16:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: afbaf02e9207e5300f3530f17b075652 SHA-1: cf6e0b8d3d98a05080113d51a4c7f77be68361cd SHA-256: 25bb09d59c17516c1ab0271c8c47cbba024b6a3c8feb44f3473de9f156360cbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://garglob.ru/uplcv?utm_term=38+humidity+in+house PDF link annotation
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4d189e2e956620b39a1bb18fb2bd0e8e/xixukixilebas.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/ruxew.pdfIn PDF document text
    • http://dnepropress.net/files/file/36563569955.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0e2cca31---gewezokubekefaxawabofi.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/zurebif.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bfd197ed8f35ed312c79ab5c52a989e5/35906223172.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3c3goe9nuein618jooj82f36023j0vj8/darudobuvifafirimifuzeg.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/6975806445.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/63998026109.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/vunig.pdfIn PDF document text
    • https://capecoralliving.com/media/file/67453630497.pdfIn PDF document text
    • http://indemo.pl/Image/files/20269816807.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079670ebea45---61596430415.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/54318453936.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/xinoravofilax.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1867c187d---lijikaloravisatofo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/tesilobama.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/58648680693.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0286b4dc---fokunozafivawerifizi.pdfIn PDF document text
    • https://binhvi.com/upload/files/begumugajebamexarunesokat.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/75638080528.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a98fa6843---71790899577.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/42078875697.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612e842ea5ac4---54805744093.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844073bfaa---wataxi.pdfIn PDF document text
    • 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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 19500 bytes
SHA-256: 4ba3cf88cccea9bc1d7275c05565c1f3ebe173fa85daf0053ce09fb37f3a807d
font_01_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 10700 bytes
SHA-256: 47d5f7cdf0cbbd58bf3c6d4a443df676d2c1f34a74f6a0f27ee564f489ed1001
font_02_sfnt_off00013c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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