Malicious PDF — malware analysis report

Static analysis result for SHA-256 381d3a994421259b…

MALICIOUS

PDF

84.9 KB Created: 2021-10-08 21:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8270e6c8d69e3ffc05a94a0416264c6d SHA-1: 5369387d369799531db3c01889418a7903c87742 SHA-256: 381d3a994421259b2062300f683918aa3c57b8fa5e3963ca39f66e07d6a5c5c1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external links suggests an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=lipoma+in+calf+muscle PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b5974c006626673ab4e1509fed3d88f3/buretivomotujefil.pdfIn PDF document text
    • http://sun-tes.ru/files/file/40674902140.pdfIn PDF document text
    • http://bluebossa.pl/files/file/fitipe.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/13821351997.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/pivuz.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/bijotuvelikifubiripixefab.pdfIn PDF document text
    • https://suruburi.net/mm/file/29581775405.pdfIn PDF document text
    • https://mediaskills.rs/files/82598617737.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/dimodosured.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/21145241999.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae43105ec---7785956034.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozilapotawi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f8905a6f3eb78d5cc5573c8e3bdd44ab/getafalixa.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/robukajebogafuxurubid.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/57601224307.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/69766538613.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/sewovuxekukibe.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/79690136450.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/dejebobakotijojonofu.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/6193128298.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/11954488407.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905175242.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_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 10500 bytes
SHA-256: 050f852621a2e9295d19d1cda0e52d88dbfe8b967657ec71d205bdb3b4d1ed22
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 19208 bytes
SHA-256: 478c2a8a72c5b5e5ac864ed7df84d9dbca121916c1ab06c8943f5b63a003337c
font_02_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1