Malicious PDF — malware analysis report

Static analysis result for SHA-256 816eca0e56c55a71…

MALICIOUS

PDF

73.4 KB Created: 2021-07-25 02:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16ce7baf72f4e66d2a914ea3135f0bdb SHA-1: aba7081af4cf84b9c1c0a980d6e5e50148753e0b SHA-256: 816eca0e56c55a7118e519583a2fd84b6b67ede5bc76921e3e9274bdb30adb76
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zcapitalcrm.com/app/webroot/uploads/files/37659108648.pdf In PDF document text
    • http://wsm.hk/images/uploadfiles/file/61723342150.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/6688129732.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6e5707931---bifazikifiguvig.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/zagete.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/nuweguzogirewigewama.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/xekusodewevezi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893502210c---tomokofujelerirasisin.pdfIn PDF document text
    • http://webbuilders.com/files/file/82884239248.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/lusiduxefobuvipimejimat.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/50983927021.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sefobebudapexojinup.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e7bc51706---jatej.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/79123107368.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/30798615619.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/432760627963f432b2be6015d226858e/31654142818.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/sepuken.pdfIn PDF document text
    • http://pneusmarene.it/images/file/soxenuwoxa.pdfIn PDF document text
    • https://avvocatoboretti.it/file/tibirexo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bd00277a4777bf3654022cefaef79981/dejefakibikexezaf.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/ximavikosokepo.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/tumobawujiweriketebumilod.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/30481266732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=blaupunkt+fm+alarm+clock+radioPDF 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_off0000bc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4B 16564 bytes
SHA-256: 6cd9e74488eddfb693e80cd6b851fa55162579b894c4797ce789b5b87ec88772
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 10724 bytes
SHA-256: 10898f776227dbf4771033503917eae2b4c825fa396c39ae31040978ee031158
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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