Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a98323cef6e03f7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 20:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2177175ae58afe8940d76456a0d8b322 SHA-1: fabea39e015f1f8fa671535eeabd79f1036dbf58 SHA-256: 1a98323cef6e03f7f7115b6d16d10ccf46741c2ce0d54880f0aab0b7e0811a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5i2d2eo5evqcsm7ovoagodm9ck/duxixubagokowi.pdf In PDF document text
    • http://koryosushi.com/uploads/files/sojenuj.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1e39583b---7917193036.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160791f803a6d1---dadizolojij.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vavimiwosuvatu.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/66249828800.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/3039570974.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/42851062573.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/67085943914.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/11032415608.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/8876432792.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7871d635---rokudetulatezoposikadiv.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/93327395029.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe4eb32aa---pafudiba.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608607d5bcbde---wefodobupomore.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/60482361749.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ca701db77e47dfa85d00d18f0f948a19/nepafegobe.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4200416d0---roravedufimanepojipigop.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/dewununox.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/44692130822.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/soxetokusinete.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089a25e8dc5e---sugiravifoporimafer.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/19072412535.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0cd6d9f0c3774cd0f09a3270697bc2bc/davoritakutiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fractions+on+a+number+line+word+problems+worksheetsPDF 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_off0000bdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEB 11172 bytes
SHA-256: bf0aab9a25a2e94ed0a49a2458fd9633cf0df2da8918af9d5a04298f9a1a3a31
font_01_sfnt_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 17708 bytes
SHA-256: 394e0b5ea1fe42c467e4958bcf8274471573d90bf586f7947dafbb4f50e4d45a