Malicious PDF — malware analysis report

Static analysis result for SHA-256 d376788b329bb5a0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 18:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d38c87a6418217712d4c07164fccb09 SHA-1: 7e828e114a2f197f46670bbb3334ca62dc9bd191 SHA-256: d376788b329bb5a0f31c2873ec816ee6b9d95d583d111e9ea1e58581642616a8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or malware distribution campaign. The presence of numerous external URIs and compromised CMS upload links suggests a coordinated effort to host and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58552c4c75---zibexojalimupi.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e81f0779b---69092826207.pdfIn PDF document text
    • https://webmenuplus.com/images/file/61186072028.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/90586105770.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/86301593779.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e11guue84v494jacrrko2o9qa6/noroletumu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/41620400179.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/vekogomifetadozubak.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105959c53808---karorirofuxutere.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/p48qbn1pbjnnssftjv9soo43tv/46093866511.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/36676551889.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/rufomuribiw.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/99080840764.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/35893334619.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/36685194676.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xupuzotugumumuku.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/12552790700.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/l3munjl17lnj23o3hmo4f0a7n5/kezifiku.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210603_726B49A19B67BF86.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/80690921355.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0f9e75c9---62728690704.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/50925797487.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/babafamabiparawaxesi.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/30712925223.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/negisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=literary+analysis+format+pdfPDF 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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 17432 bytes
SHA-256: 9a2dcbca7e1d7d712640b4688f2aeee1c2242bff7b08a75a896f8e56b51ef39b
font_02_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 10728 bytes
SHA-256: ab07ccae1884f49bdedfec050cd1e4514031793af040103f0cd74027cf450fa2