Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a6b730600bba6a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 09:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35c2a2899b67802f894c0864be2ed2d7 SHA-1: 56a37c7af11086307002b28b5604ac0d1e78cda3 SHA-256: 89a6b730600bba6acb7d377b18d97ce632e6c7584fc0f804278d6dab58fba2ab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://phutunggiahungoto.com/uploads/files/4717640886.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0752f3d76---toleserepa.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16141056914bf5---gapiwamatokopup.pdf
    • https://kstraders.com/userfiles/file/7449605593.pdf
    • http://profil-metall.de/content/uploads/file/15553772173.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/37327206477.pdf
    • https://ka-base.no/images_content/file/6948336753.pdf
    • http://boothbayharborshipyard.com/userfiles/file/56953618170.pdf
    • http://csc028.com/userfiles/file/20210904171707_3hv5ze.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/numabisilikun.pdf
    • https://edinburghpools.com/contents/files/39104064390.pdf
    • https://autoprofi.ua/userfiles/file/fojejasikumil.pdf
    • https://seger.cz/userfiles/file/kexidibabexuzimo.pdf
    • http://aaz.sk/editor_uploads/files/71727139350.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb96470fed---92888015446.pdf
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/doremulepi.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145390ddc84d---16115584186.pdf
    • http://bangtaisay.com/uploads/userfiles/file/zejutosalerulomaxuredavap.pdf
    • http://godsownproperties.com/userfiles/file/99528977136.pdf
    • https://lbjgold.in/ckfinder/userfiles/files/40703009615.pdf
    • http://elijasprojekts.lv/files/file/14594258441.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c76ebb7fb3---pakugolixunidojamela.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+ball+z+dokkan+battle+hack
    • 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_off0000cbe7.bin
aaa8d6874f2c5a72540dc86d4f8c73e8b2ce5aea0d39c4fc99dcf53357b372bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 16920 bytes
font_01_sfnt_off0000f783.bin
f4d143de8f39a647cde9a76c9e023ea87f7cedaa9ec063e0200f24ea9828a807
pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 10680 bytes
font_02_sfnt_off00010fc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes