Malicious PDF — malware analysis report

Static analysis result for SHA-256 d000340c67360c57…

MALICIOUS

PDF

106.5 KB Created: 2021-08-16 07:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dc8949a9f299cbdb48f30e371cd53cae SHA-1: 4c272c3fda8481ec4d87c0c940a980f003e86cc9 SHA-256: d000340c67360c57780811b59fd7c803d711d096e67bd579cb9177c98ff43292
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading payloads or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ceb06b8bb111dbbc39a7037fc7a1e48/kotuzaroriteba.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753816cc407---95119033693.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a7224affb085e15fc4be73ee73f36ad6/68827911183.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/xixaf.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/14315674150.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/00sk7fe35dna5ok9sa3d413lf7/razutufalexesonukelu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/27664590113.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107280237199194.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/54814df9bfc6d109c2c9af531a2f9385/60107756923.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/59345de2a8705ccf138cf98a7d539579/1107607173.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1bc98c2a03a11dac4b7d3afb470755c5/xapagi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nked7js26rljaedkki3tn3uh53/51839257408.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/58734672441.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/bipakubel.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/vilipoburivizogopumofe.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/39308301387.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/28203592429.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vixozupepa.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/1107958580.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a18aacb2901---wuxem.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dc7e02ad7acaa38a748e42f015b7c7b0/2550369859.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/70963475689.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/vudomejuxexikexemozurok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bangla+voice+typing+software+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 11116 bytes
SHA-256: d2df9d7a4f13b849bd874ef817f410c356c9fa848713b9a9d00e28524dcfd185
font_01_sfnt_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0001520f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520F 19256 bytes
SHA-256: 785e608c8acd603d16290a784a7731841268bce57487b51c3dadc1d687d22ab0
font_03_sfnt_off0001834d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1834D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1