Malicious PDF — malware analysis report

Static analysis result for SHA-256 725cc547262b20ec…

MALICIOUS

PDF

78.0 KB Created: 2021-08-31 20:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef4d75e85746d19d7810809cfe6ba133 SHA-1: 7fbf8b5e806e7abee81a190d83b9b022d446ba11 SHA-256: 725cc547262b20ecdc06a4365ba923c82f2e5902e67661f996302f216187e891
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to potentially compromised CMS uploads and disposable hosting sites. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://digireg.pl/upload/nalabusunes.pdf In PDF document text
    • http://vxclouds.com/userfiles/file/dokaropi.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/6343900673.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d70a9fbe---jexomusoviwo.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zewokabijonivigubo.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/takadokipoduv.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/salifuxuj.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/76894410463.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/lowewukefomuzisoxinezuwa.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/42972807670.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1089523968---rexoxudidotiliguf.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ab3e4327d---tetaso.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/2499941168.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/75300901030.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d766f3a92f975a003fd8e11df08611ee/xemagavorixamavalulilu.pdfIn PDF document text
    • http://chpcentre.com/files/file/zetewusaka.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbfcb8487---rupotuvagasivizufaforazom.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/02dc580651025e06694f136ac3fc2780/medolur.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/11245500837.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/newewisorafofu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/dewurinixupejuto.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/temiwogaxijopifogagebofu.pdfIn PDF document text
    • http://acril.ru/ufiles/files/58552137828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dulcoflex+suppository+for+childPDF 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_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 10768 bytes
SHA-256: 6f1a38cce66fe93e19708933331f9291eaaf7075f5cc616255ea04f325de8802
font_02_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 17276 bytes
SHA-256: 3dd9677cf77a61bca54b82ed0fae4e5a7f911c380ec43a9d17183b87d769173c

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