Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc92003fafeae23c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 18:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c685493aea3131c227a0140f2626b599 SHA-1: 7e51173a93ad98d29c1deea1cb2057c8920a701f SHA-256: bc92003fafeae23cfd8c0f85d32855cef51d2d8b29f98ae2d8e39e469ccb35c8
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for distributing malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=motu+patlu+comics+in+english+pdf+free+download PDF link annotation
    • http://imobiliariaimperio.com/files/files/62649388307.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/woroxosebotovabonefir.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/polexifol.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8986c5ee---93963767621.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130aefe248d7---mefekinefeputonabanir.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/84232419480.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dazan.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/61605139415.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/juxunemojoleger.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/88193173558.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/25537075671.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/4398695296.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/rixogisafolazavavigajori.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/jidelufaxogu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jm3lrq2ub2oa4faqoh3se7rrp3/87041264628.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d107bd731---77516160823.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98974381505.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/pasejuxugutakage.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/69469806202.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/28556683347.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/89344506042.pdfIn PDF document text
    • https://mashura.co/userfiles/files/83897404622.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/13095740962.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/54648491410.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/33058339626.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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 19280 bytes
SHA-256: c2085038ff81e446a1b3a29f7949e548a4a1b923e7260da6afbf2fb116553559
font_01_sfnt_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3A 11244 bytes
SHA-256: 81deffc04c0e453b94503f908dc23bcf74277caddb283f35f07a905b06428e15

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