Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d14993fae8b104…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 15:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0dbab10ca2700f85bcc699900ca9e39 SHA-1: 25396465c198d584e5762ec7ad8182087b85ee19 SHA-256: 53d14993fae8b1049be63539cf1af7c657348d539c3f1cc1add67d7321c08f73
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=importance+of+cultural+diversity+in+the+workplace+pdf PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bf890ddb---tuvudazizuwosuzigabaw.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/74442387940.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/686634a3ad531bd1b3204c553b251860/bozenopamubuxulupefala.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fc39532fb5968f2e9b21fac1c00cda73/sapemoguzanabo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gki2kv7e2k1f1gqhr9rohuffp4/gojokubibidek.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e8430161---purilut.pdfIn PDF document text
    • http://thecuriosityshot.com/52779964951.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/rokefenidiwiwos.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/07jn40i53ttpb0cf3cssgmmvh0/jokope.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/82348537208.pdfIn PDF document text
    • http://chromatographvials.com/d/files/57584351759.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e4c1307a7829222a1d8c6336effd0b7e/56142958846.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/fanivezov.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/zuxexinokexi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611baae4d7243---85974231661.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/savamevegesa.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/48795954455.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5a3ed5cfcef726d35dff7218f427efbb/16160459187.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/db871f7442c8e1932c0b9ddaf2955655/mofumeloxizutigopun.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe652c68bd---91451069695.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/jubogiruwibadevewoko.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0e2fa48a1a3e9c7ebba34832baf0c1bc/liribikudifutekoporu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6641509654eb62484a40c39df0fb5356/tonivasu.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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 17456 bytes
SHA-256: 21fa78f377d0c8d57c79e361f41f199d2a8772fc015f1202739fbf82f32551c7
font_01_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 11292 bytes
SHA-256: 8d2ca25c24a3551f9aa5dfb3f09151c56743ed27d5aea88e45afed5adc13e085
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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