Malicious PDF — malware analysis report

Static analysis result for SHA-256 239563e43faaaa11…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 18:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cde5d1eec51d47f4d17cc86f30720130 SHA-1: d893e8b053ad21ffb6b4f47bce6e31608e325501 SHA-256: 239563e43faaaa1151bbfd514de9111234917ca5b5fafe09a31487a7226e4026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147345b1e23b---72782317445.pdf In PDF document text
    • http://husplaza.hu/editor_up/91606460583.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/98162932118.pdfIn PDF document text
    • http://aven.su/userfiles/file/74548155256.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/rojebatomodakojobalupona.pdfIn PDF document text
    • https://edarky.net/data/file/petapabukeragaralibizafi.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/tajunijodek.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebce0eefe---95582849297.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/zurebamabewepulugukuvipu.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/mipedipi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6ea8bc441a9809a419f0d34981c0f61b/fuzapuxeli.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/25796879637.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/41643642040.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/mejogudibapovikiguso.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/85815853392.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/gajiwar.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/68912730876.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/66499276378.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/84272010605.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/4703706539.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109130122258999.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jifukojolusirezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quality+android+gamesPDF 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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10864 bytes
SHA-256: 47b2ca9cff3ada28b30a50b8d3634f1b0194a68f4fcd88c871beef62856c4319
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 17328 bytes
SHA-256: 37248f9e95d4e4509e7787c5b9ee6cc3559a67929ae34f25484d8fbd2e1e927c