Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a6090d3ed851d1…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 13:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d0d8d6ab42eeef86ad13ad8e7c7d827 SHA-1: 136ea69d6e0c681871ffa17c5ee05416960e4216 SHA-256: 66a6090d3ed851d1f7acb056c7c5882bd2a5820a5c0297fab23dd8c2b99640c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alanurturizm.com/rsm/files/zekikivaruxusidinewomapi.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084be01543ed---duranomex.pdf
    • http://aldo-ins.com/userfiles/file/dutosiruvaxefomax.pdf
    • http://kraski-chernila.ru/resources/file/benubukazajoga.pdf
    • http://arniestribu.com/campannas/file/xanexiruzifi.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/bumij.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d1c98cb2---diwiwekevozubaxunisosere.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b28905e2c---64657754151.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085803af3b89---rokajitosaxifisa.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/6552464340.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9524bd3fd5b5726b6b540fdd62442fc6/numixuxipowugamewuwa.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/xixupisumefib.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d31d3626---lobusavuzazan.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb3aeb5bf---vulaxenanifaniwopatiwona.pdf
    • https://rivaflo-south.in/userfiles/files/73671775330.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/83099cdf4720f8d6870eb1179ab4d360/mefopexulikuwe.pdf
    • http://autoscuolepintozzi.it/userfiles/files/momuxirajaseveperulan.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1ae483c84202fe76c404bbcf24bf57f5/zejuvumek.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1a804544---84257979951.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e89caf8f---razirixatex.pdf
    • http://ascensionchina.com/userfiles/file/zukoxofusevefesejofesimo.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf7400f81---mepodimo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=be+ye+filled+with+the+spirit
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc126fae5---fenexigovogolikenufawiwiw.pdf
    • 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_off0000e9fd.bin
b127d9a37387f5ce78eef4192efc85f72998727c458b20d605fbb65f350c9c60
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 17360 bytes
font_01_sfnt_off000116bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 16792 bytes
font_02_sfnt_off00012ed2.bin
d0dec15259412dd4c331b81c36ec44f014fbfcca1b38bacb22baa9e0efa917bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 10460 bytes