Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19a7d138f0d3843…

MALICIOUS

PDF

84.7 KB Created: 2021-07-21 01:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a11fe0605c6172d4129e2e434cb10a20 SHA-1: 2f57ad31293ab576af4ea56aa959f8d5d15933ee SHA-256: d19a7d138f0d38432ba4666c1eaaf21a8da218ec9bae2f79f5fe6b53745def53
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The ML classifier also strongly suggests malicious intent. No scripts were extracted, but the PDF structure and URL patterns point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ivanda-commerce.hr/userfiles/file/lulovirimeram.pdf In PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/tefuxiseradisuxebobebik.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/komadusivukojexumiko.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/17206889719.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/konozepe.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab4eba5dc---sigomog.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/14de66e5b57f6dd45497a93c06efcd59/30858891347.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/dudep.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/1k492ei08sd44pcce62fjgh5qo/68847526577.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/362071185f8b2a11272f9a3f00941aba/95960775144.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/21867072154.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/81586965023.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/70149380713.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/351455977246f25ef17c1b774383ea93/vomowoziz.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59c6cce28---76788206720.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6edc87a6c---20746758445.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/damonuduvizag.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/98034327063.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf770a06cf---12701062628.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/witofasuzebuwolokoxub.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dk27lqrj23mrhcpckv2lmltuo8/54368809815.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c2e0058c6---masadezufifomurab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=painful+indigestion+after+eatingPDF 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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16672 bytes
SHA-256: 6d628ac1d0276193cd95a4f9f0e877182aa0503c228067ec436a1f2574ccedf5
font_01_sfnt_off0001159f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 10632 bytes
SHA-256: b78a7f7712f579e25f6453b68976d5616f5d96002c63346909e1782c862fb316

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