Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2db1e599760a9f9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 21:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c394b34018a2fb5b8ba72c58a5ef7327 SHA-1: 7c2f89e5981f6ce7cdd10a0560ca82e570a66155 SHA-256: f2db1e599760a9f9c870dfafe9362e11ccd8549a691e946070f58e6351acdb76
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF that impersonates a cloud document lure, aiming to trick users into downloading further malicious content. Heuristics indicate it functions as a link farm hosted on compromised CMS uploads, with multiple URLs pointing to PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7cda93e13f4222bf3ac1859fdbab55eb/64731664353.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e923e3c33---kivobudubalalerobeb.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609020d1807dc---77203368810.pdf
    • http://imreelectric.sk/uploads/file/61145474530.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/subisun.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4bfafeaa17e5ad85aeb47bbe81843ad7/xudagaduvor.pdf
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/31314928318.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ab4ef9fa---vomugakedevabibafopot.pdf
    • http://asckhn.com/acskhn/userfiles/file/96057387378.pdf
    • http://bbdecontra.com/userfiles/files/jopilabafogegu.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160800bab17947---navudelirowedu.pdf
    • http://iact2001.com/userData/board/file/98697237308.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5382638b---446291735.pdf
    • http://kasintorn.com/images/upload/files/lisizoguwi.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/32587189725.pdf
    • https://cleaner.pl/userfiles/file/gowazosowagataberupegu.pdf
    • https://gymlesgeants.com/upload/editor/file/rabelawupuf.pdf
    • http://khautrangkhangviet.com/upload/img/files/58808669539.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2af68d9de---vujizesopiwebid.pdf
    • http://tydafa.com/dafa/uploadfiles/20210819110815.pdf
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/milezagekejatuxirirup.pdf
    • http://altinay-law.com/images/file/viwapegosejutopas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+merge+pdfs+in+google+drive
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2c.bin
6dfb3eedb7436db18ec2c9158269302bfe5f8b09c9a2c8e9a7c8413271c22932
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 17060 bytes
font_01_sfnt_off00010b55.bin
f12018b09f4148fd186278677c5d9d8e8d814a91ded2cdd042210ee44e2686bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 10824 bytes
font_02_sfnt_off0001240f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 16792 bytes