Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7b9b15d64a9f01…

MALICIOUS

PDF

106.5 KB Created: 2021-09-07 14:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a69ea808f184512189e861748378dc9f SHA-1: c20e4553f0a9b9ba39e2269b7865e91887afd769 SHA-256: fa7b9b15d64a9f01cd6e9417ef7bea9f8d98b60f06b8fade7b1f5be9d6f82328
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bacninhonline.com/webroot/img/files/35192184340.pdf In PDF document text
    • https://vinatech.com/userfiles/file/95312679049.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/v9tkbujiovel0lo4arsmvgtdj2/popuruguzid.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/fanojegumadewol.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aba2ed135---fidikefizoz.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/81cc5acf01ef3352f53a59638af7c91d/41276200981.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/55400577213.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079134493f1a---vovegotijutewufavij.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fizabifizanowubaronaj.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b724079b01---44681252024.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/51111030471.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab73411a7f6---83395102681.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d75b4efc---resugegowek.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/wijumefajogizikoripox.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fff85554fc9---bazeruzopojelutaxomorij.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074670584e83---71870790426.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d78c11c9f40f1b1c4ad2c66d472e8a55/ziselulorutetenowataraj.pdfIn PDF document text
    • https://ocw.tw/uploads/files/gupiniziwuxalapij.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/giknd9bndbu0d7sgdfknp5i4sr/14343611939.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/74860530665.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/8545302522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=large+squared+paper+pdfPDF 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_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 10416 bytes
SHA-256: 0716aa3ff2d0f68690a35b4c892e3fd440cbb4e1ae56cb5a7b888eb68a6f3fb4
font_01_sfnt_off00014f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F41 20768 bytes
SHA-256: 668c5d419c6c39d7a10768cffa099662115734791caa8abaa043a78bdefe3fc1
font_02_sfnt_off000184a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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