Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5e18f2d3385c8f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-14 07:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2db9dc1abf2b2fba5bf2f2c2fa6d279 SHA-1: cc9b5495241161f5e5aa3205e8a436513a9d0523 SHA-256: 7e5e18f2d3385c8f79312c14a44a9c6064f25000ec6add792ebc1c6d8067ee9c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS uploads, suggesting a phishing or redirection attempt to deliver further payloads. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a414a17e7---rafebidokipup.pdf In PDF document text
    • http://debeleven.net/UserFiles/File/xomalo.pdfIn PDF document text
    • https://bauarch.bg/files/47314060055.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_58C0800C794A03B0.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tonofekipelekopubunod.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/84010099733.pdfIn PDF document text
    • https://hoalavender.net/upload/files/libisag.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/19935158541.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/jamunaj.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/lebufamebosaka.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/98839065729.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/tidilorimenokojanadusir.pdfIn PDF document text
    • http://chpcentre.com/files/file/vidivaguwemuka.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/tekukukava.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/zewelidakeziruxilizagu.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/jorasuf.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jeturom.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b675a5de---54131320270.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/ditatuduvukekof.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/92004724650.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/42749929652.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/55417611232.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613130c0b7d53---jogefubajujuveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=www+watch+online+movies+com+pk+dhoom+2PDF 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_off0000bb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 11036 bytes
SHA-256: 0f948106cd2ef1e95c6b8fb4c7b75361df78f44e82725c27788779cb67bb203d
font_02_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 16508 bytes
SHA-256: d1210503fc509749415215f3ad2526c5f8c6a2a81c1fbfdf4591c80a17a640c8