Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34e6b104ca804fb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 03:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78275d1c6f33e297bef34beca081236f SHA-1: 7cb3842ab8ffaf4f10468f5ebf09fc4518daf485 SHA-256: d34e6b104ca804fbb56f4e3db83021e7e82c2245cd4a34967f1b6109fbf674e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm hosted on compromised WordPress sites, with a high ML score and ClamAV detection confirming malicious intent. The embedded URLs likely serve as lures for phishing or to download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac48f1cc2c---xinirovuzebotiximaxaw.pdf In PDF document text
    • https://angkorphotographyguide.com/userfiles/file/27352636600.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86d3e29d9---39912686109.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wigivugedotupanifa.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rebotojagamebetobidegom.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/sujijexipuwur.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/kunigaxegusokit.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/dekigi.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/lezanosoxivazon.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7b56ea35---barigonaxodaxin.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/jakufulanabefikuki.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608affd3cd240---figudogejujemefogote.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/ladovuwawavixatomuwok.pdfIn PDF document text
    • https://energooptima.hu/upload/File/tulewan.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202108file/2021082008322570554.pdfIn PDF document text
    • http://surtek.biz/image/files/20150227_172625.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/42321252840.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/35824034558.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422b6bc506---48246554914.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/47384339026.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/35568030470.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/lidofabekimidewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=materi+perulangan+c%2B%2B+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_off0000b452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 10600 bytes
SHA-256: 7e9290732e39e3299c3de6e620b785dbba351d19e4b6cd3fe269328a74eb5b5f
font_01_sfnt_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 16056 bytes
SHA-256: f8acf58c09a2ab5ed2182d95c75972bcb7c3c50376ba23708bb502bbf11388d0