Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacc21a3b8c5361c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 05:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 296dde4017e3a3e26ae6ef1e7a50ec9c SHA-1: ac96cda38a17619bbe6f057da29c18625d958cf8 SHA-256: dacc21a3b8c5361c9d6720df66e0f146362b4c01d917ea934d7dae3f0c5890a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification as malicious, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=bus+simulator+mod+android+1 PDF link annotation
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/34d7ae522add717e1678b65d16b04c56/sikemikalomidedazo.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zibafamamuraguvolo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613432a47618b---45787939151.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/76009353476.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613008dc1d9ab---busuzifibelobasulonij.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6f649e54---72030215451.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/denopikenadowozeji.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c010e70280815083cac22768ea2448b9/61821549012.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/79341484758.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/26598109700.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/genotujadewivaxevuxegobes.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/jinexepetuxusi.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/29560583593.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/xuvovupekojurinoxenixis.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/81192525168.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/18892341347.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/meporemukalibudewabe.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/17825005810.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/39931298025.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/solejesixebak.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/65356577051.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/30724594736.pdfIn PDF document text
    • 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_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 10480 bytes
SHA-256: 08410cf87884e0f646a11b88afcddcacea953842b7a66b735df24f16088bf0c6
font_02_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 17140 bytes
SHA-256: fd050cdce1d6f5ea8f85189399ca6534ac757c4d364d27501e705af379fc09dd

Open this report in the interactive analyzer, or submit your own file for analysis.