Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1233dfe4b586d67…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 03:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62c197e6b03f51405f0d0ddbd5556cab SHA-1: 39057a5e1551ee356e341404e501eda2a015eb85 SHA-256: b1233dfe4b586d676c344340c2fd94099258d7580de40a2a911fba9f11add050
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings and URL analysis confirm a link farm attack pattern.

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://hophungvietnam.com/app/webroot/uploads/files/21298142719.pdf
    • http://4grd.com/cmsimages/file/68275162105.pdf
    • https://funbugs.ie/files/file/73492141477.pdf
    • http://www.tsahimmongol.com/uploads/images/files/90434016740.pdf
    • https://kitapkapla.com/upload/ckfinder/files/naxisesenevakofad.pdf
    • http://panel2conso.com/userfiles/file/koxatezikutaxob.pdf
    • https://rubenoferro.com/userfiles/file/nasapapobewifukenunoxibi.pdf
    • http://teraval.cz/res/file/nefovewidulalubim.pdf
    • https://fluffy-chins.com/images/file/xovabumegenomodik.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vofajixipoxuguwujewi.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/fujibibanimofebofigasadul.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6223e4b04---kiwalojirerizipul.pdf
    • http://j-line.ca/fck_upload/file/vilukoraramizuguvafunot.pdf
    • https://steklo-shik.ru/userfiles/file/62832608527.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce7cd647ce---52949650399.pdf
    • http://eurolocal.info/sites/default/files/images/file/raroju.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/tokabonozosewidi.pdf
    • http://skupka54.ru/upload/m/32587807960.pdf
    • http://polipack.ru/content/file/fademazemururul.pdf
    • http://siciny.eu/userfiles/file/28004636469.pdf
    • https://minipowerpack.net/upload/files/64075968625.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148c8a9f271c---92722724072.pdf
    • http://cesurmakina.com/userfiles/file/ronexofovidazid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kodi+19+for+firestick
    • 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_off0000b8f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F2 16792 bytes
font_01_sfnt_off0000d104.bin
b295c511d329c02e59c44301c7be9eb022c134c6c7412fdf4a936ad5ddd200c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 18756 bytes
font_02_sfnt_off000101ca.bin
23e1cc3237a2c8cf49ec50c40085e6e4a35c77b9c2fd5147d17e47d25e354f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10460 bytes

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