Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c30aeff4eb15411…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 23:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 780237e1fe3bdcc6467be50f6a4f2cd9 SHA-1: 60235c2a2858e6f11542599db8b13228fc77e4d6 SHA-256: 7c30aeff4eb1541185110aa85f4aa166ddfe8beb94c752df8de3b848916bd30d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL distribution align with common tactics for initial access via phishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://bukharajohnscreek.com/sites/default/files/file/51536096277.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16079e49895dc7---rirefebu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/muvaguvigufutagutudi.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621032977.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/dadukagibatezibuwilapi.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/61357820037.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/32010590595.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d55d276b8ad8f656892db3584c5332df/27652426537.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccb0a0854---xugijumo.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nasoxobawaxani.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kilarevumabojafu.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/bipozemudipowoj.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/mijorovudifakiju.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/sogupaneruleb.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/12962862741.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/baluvurekabomifizize.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d823fcf17d8---gofevifugeba.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kawesojidopasujixubika.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/xodevutafigokapapurogibu.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/90790236571.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c9ff177a---gekixebe.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/zenedugenexusigutubexowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pediatri+splenomegali+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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 10840 bytes
SHA-256: f954b3ab883e47193040b99822a440b9dbba53b3b38ee78cee9782940f93f139
font_01_sfnt_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 16900 bytes
SHA-256: aad1951c04936aa979dd4dd0667fe3006202dde8ec0c5996f590648a78401619
font_02_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1