Malicious PDF — malware analysis report

Static analysis result for SHA-256 a669cb9ae826ba1a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cf94cd1c047b0f035e739f6cc2decc9 SHA-1: 6e6ac3de8277ca626587e93841030a50537ed42b SHA-256: a669cb9ae826ba1a99409ef8ffebfcc1be40a03107209567f4ca4aeb2dcf1db1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to host malicious content or redirect users to phishing pages. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous external links strongly suggests a malicious intent to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/932288311e1dfca2175723aae40066b5/54718948337.pdf In PDF document text
    • http://euredit-editions.com/userfiles/file/22246632357.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021810210455606.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/64126161646.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f7ff35trtqq77q8cgbn06tvcn5/48312595720.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/kurukom.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dafisidikufuzabowetanefa.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ad81443202c2820178b9060b289dd88c/zaxozebeju.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b01468aa6c7---luvigorenevefokilo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/67742385595.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xikifugavikuw.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/jorasitalakakofekus.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/lupuzodibola.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/bivafavarijagizetinan.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c862cae284---xunotubarutefuwuzaso.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210523152231.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1543294469---polirabekenozifu.pdfIn PDF document text
    • http://asustainable.com/global/file/69831637322.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/fazejitimokatefipew.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/516780b9518f5e931844de9354e2bfca/gilavawuxitikumodimuv.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6bb8f7e0---gidafusimopijakuzu.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/fukodadidukelane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=classification+of+silicatesPDF 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_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 10260 bytes
SHA-256: e360b8058176d0d31de0aab7585ecb0ee83bc3fa30ea6f7931cecb825065a56c
font_02_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 18484 bytes
SHA-256: 07fa7fed630b300152dfb12df15191a5bda2b112786a93c2e470ae998f13d9f7

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