Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6c2065dde913f0…

MALICIOUS

PDF

78.6 KB Created: 2021-07-09 01:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e896a8ca220707f465ec6668ae5593d2 SHA-1: 7c1beafd02cba3068d0f4cccacb586ff15683ee7 SHA-256: 6b6c2065dde913f061e3c7ddc4b20deaacc0cae8945d6883ab75b8b7f8f9c23e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b44d7m9hibencb9nelebi84nm2/25533806503.pdf
    • http://etasystem.net/userfiles/files/91158919776.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/delulito.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8c2ef440aace0373c859f3b65d0df6bf/33569216168.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/60183ba40ec9c7db7beaa96dd5b23a09/sixuzufu.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/97486975238.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c2a1494d2f83b6a156eee842adc1cea8/wusus.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8fa13907---jatewoxegivezolubapanop.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0199ce8e0---xulutabefiluvofoferifowa.pdf
    • http://hsound.ro/images/custom/file/pevefisej.pdf
    • https://metricgroup.it/uploads/file/3945392996.pdf
    • https://vanvoorst.info/uploaded/file/vuxefip.pdf
    • http://verynailscm.com/user_img/file/42325756229.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818964cef4f---84136013328.pdf
    • http://valleypainclinic.org/userfiles/file/56685618868.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608788bf21aaa---72810102417.pdf
    • http://nuestratierrapremios.com/campannas/file/kavitoposisosate.pdf
    • http://analogsys.com/uploaded/file/139125664760ac37bd07556.pdf
    • http://zrdb-drogbud.pl/Upload/file/25707549654.pdf
    • http://clairerolo.com/userfiles/file/55914170398.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/nibutolomunatelijavoka.pdf
    • http://flooroverstock.com/admin/userfiles/file/58231670777.pdf
    • http://vds-construct.pl/userfiles/file/74126474334.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=emily+blunt+and+rupert+friend
    • 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_off0000ce20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 16792 bytes
font_01_sfnt_off0000e632.bin
4fb572c55e949ea48bedbc306ba2fbcb3dab91332e60f9c89872d2ce1ce17fc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 17888 bytes
font_02_sfnt_off000114c4.bin
433425815f440cf9bcf4925ede43233e58f13c7aa6b13eb7011d543b0b5a8744
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 10708 bytes