Malicious PDF — malware analysis report

Static analysis result for SHA-256 185867cf6d94d5a9…

MALICIOUS

PDF

93.4 KB Created: 2021-08-12 06:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bfb39d7ce153222c1316efdf8797144 SHA-1: 2544a12b7436294744ef6069851ea50867283406 SHA-256: 185867cf6d94d5a92b1215e1c01a3fe7e393a6affc4e59aa81f2e0b44cb7a9f4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df84ec0efc3---lalanopotuw.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fdfa8b746---wulaxaniwesuxibavu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a1064881be4f38e3713e56f76dbc94d/96073308928.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/48910589386.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f1f953af2f2eed4f3f7c7ddc50b76fba/tisemubun.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/60365299341.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/13839490634.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/sakuwejoxur.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160757709d439a---mazanelinozowazux.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082638ff277c---xusurefapirezalovoli.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/25011769079.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/38114801119.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/kgaaq7d69jaj9a5ir44uprddv4/xafukibuputogiromimadu.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/492f82af7834450995e20425fd81bac2/88170961903.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/rarewixubib.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af844050112---fuwut.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/sofagiwizuzufuduzazaz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/80418efbc35c9de725e66d7ffe428b24/pidenipelepevepegafilutab.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dddf3e4584---ruzumuvikadoke.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3eea6d5a876a4633e78bf650244169ac/zuvewumunabitonut.pdfIn PDF document text
    • https://egf.tw/test2/images/file/92272439446.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/81432094302.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/mipidokixosonido.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/xanogulopuwemebar.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775556e99ec---tubimosatexasuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=blizzard+beach+guide+map+2021PDF 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_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 11120 bytes
SHA-256: 46fbb0c89ebf9185ee53dd0c3558e5af92d0e56ee6a94df7ea370bae6d3dc3d5
font_01_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 17104 bytes
SHA-256: fe94220f41889355483315f99648fc5c51e24b1f3deb7ce487b4b2877a13a113