Malicious PDF — malware analysis report

Static analysis result for SHA-256 6149554b15b45792…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 21:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c5ae60faa00001e72b9abd3a3353298 SHA-1: 5c2499ac11320b68753d2502704bd7284fec59b6 SHA-256: 6149554b15b45792501f6f4542b4211e779a113b540e6caa6b3f278f6825b2c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting, likely intended to lure users into clicking on malicious links. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62d290443---91314780835.pdf In PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/bekimukibazumumubuxev.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/gitasidawuv.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/xagiwulomedizevawesutuso.pdfIn PDF document text
    • http://wsm.hk/images/files/30570969053.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/36962357549.pdfIn PDF document text
    • http://hkacca.com/userfiles/zawiwadeg.pdfIn PDF document text
    • https://rosycaffe.com/file/31857912702.pdfIn PDF document text
    • http://ipceurope.be/assets/file/20960302247.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/80246118400.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/98084034536.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ujafudevarez.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/41756885858.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sulizilofigokuvuwekabomos.pdfIn PDF document text
    • http://precisao.net/files/files/27592576931.pdfIn PDF document text
    • http://meta-min.com/files/lojedodaketesewepasojele.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/89102540306.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/71957989838.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/39533487424.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e57cea81a59936ca1cfac57ed1aeea4b/54183759399.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/42090224261.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0ba17ab0---58063981075.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/15314314511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ps4+emulator+for+androidPDF 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 10692 bytes
SHA-256: 07b642909a6657b0467f526ac5a0475f58a445d06dafe50fe61cac208994aaf8
font_01_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 18092 bytes
SHA-256: 19841f19b38f0411c93ce30e1509ff815416889781b243c292406de882c36dc1