Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7f72945b983dc4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 07:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b52dd57d51c392f6378f79829bed43d SHA-1: d5d38b7e16b71c434d9b68b3faa2fb862164a250 SHA-256: 0b7f72945b983dc42b18bcef44ca387e55d5a6366de73171609f8f4361c09f16
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of multiple distinct hosts and UTM parameters in the URLs points towards a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=blue+cheese+scalloped+potatoes PDF link annotation
    • http://www.thaiboat.net/image/upload/File/39034313217.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c663ea152ca---80794267827.pdfIn PDF document text
    • http://kco.su/userfiles/file/tifabobumej.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75f83f5f8---21748915000.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/subada.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2cnqtbp55ijrb4gio1ht1s5hde/73242615886.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e909e4f7b---xunupobuzipuz.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210717123632.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c19b9210a4a8b4e7d115327ad4c16b8c/7219245505.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/27128699461.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rokixewawilukeku.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d1331707c84d78064beb61ccb4dbf1b5/zugatikelusixupal.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wolemoziwiku.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/14018433713.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85765470255.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079c19f323ed---78429518735.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/nejumurojizokemejikoxa.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/o6nhdgfgej0ilregfmbb24tb8f/46891369959.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/40257257102.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/zogepapariruzibavesu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/5054531791.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/17249268859.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/difosuzatojubivavowixuxen.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/11251180818.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/85333609015.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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 10468 bytes
SHA-256: fe8a75e512337adcd99c409c7eca5515d9d8721287a94e5d84c631d661624447
font_01_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 18524 bytes
SHA-256: 185b1ca40e8732af4cb2ae9bd55b7b71b91791956b6e0dd8ad552c94ddced51a
font_02_sfnt_off00012cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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