Malicious PDF — malware analysis report

Static analysis result for SHA-256 9728dfdd2a88b1c6…

MALICIOUS

PDF

166.6 KB Created: 2021-09-01 00:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 377e40ec1fa9a741a7497af4617b57ca SHA-1: cf60b5a6bf38c682d3e4050ba4ed502d23a19ac0 SHA-256: 9728dfdd2a88b1c65cde283795efb8bff9c297f36d7620fd9b84e62ecf2579c9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ildongwire.com/userfiles/file/78083693019.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8fcbh6s85v0iqe7nb39bk232d6/mefaleturuxeviliwukeraj.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/45442474256.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0516d3e661---90038059438.pdfIn PDF document text
    • http://argumentua.com/i/file/7352932377.pdfIn PDF document text
    • http://drironcat.com/images/file/23719827841.pdfIn PDF document text
    • http://binarbaid.com/public_html/userfiles/file/67081936134.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f2cc3f7db---lefenavopuwefugizoguruxi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/maxuvunebagowebu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/womidonejikafigojig.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/35247172534.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/251500671.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7db1577d---xunepifujelib.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f82f06f75f48b4b7d330874d78bd0e5f/jotuwo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070721184f7d---97998076989.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/beweg.pdfIn PDF document text
    • http://gtshotel.it/images/file/91879277531.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/jisidozejetofupadotugavij.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/tufuguvedux.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/bijijoresuti.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cacc4bed986239ea1a597ea28158655b/mimawofevuvajifamuroxelor.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f6111670da4---16219257908.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacafe8401---59151055567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=deephaven+mn+countyPDF 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_off00022f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F14 17372 bytes
SHA-256: cefca6a04b633face64e28b3097976fe5ad072a61bfc8852cfc25e161018d710
font_01_sfnt_off00025bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BF1 10512 bytes
SHA-256: 77e616ffb9b82c553570023ddb66ba6bd1e34363a5785930e9c80f6f770ef5bc
font_02_sfnt_off000273c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1