Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd1c6753b9abe3b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 19:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8505968df0a04d0022e086cad99a84fd SHA-1: ff029319a5c1c231585ef4535544cd04c2c67de8 SHA-256: 0cd1c6753b9abe3bff0745f68f5cc430257ceff198a64fbaae4f46056d6d9608
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate a link farm designed to direct users to external sites, likely for phishing or malware distribution. The ML classifier strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=android+kunjappan+watch+online+free PDF link annotation
    • http://kingsauto-bar.com/js/upload/files/gilatikevowi.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/lejanibegove.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/96812668803.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/43284869746.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/bobilitipuwet.pdfIn PDF document text
    • http://compsult.net/userfiles/file/68508705286.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3quluvoitrb1d19fjttd9b9g14/bakebubiketizudibuk.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/68731842143.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lomojejegulekas.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/japofawazetupo.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/71439126761.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/38740432087.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210909132734.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/53200135016.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/wazikumojukudem.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/14853108504.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/9774151531.pdfIn PDF document text
    • http://cycling-software.com/files/file/sopusovuxudi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31b2a5893---6635844246.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d542f57---voxilagofogexuli.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/wulexidijabixo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/31m070l01hdb8jog71lha18sfj/fonopejuzerufetirokakivit.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/83393264637.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/35585212521.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2dfd10dc---3479647139.pdfIn PDF document text
    • 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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 10940 bytes
SHA-256: 2e2cd1b8616e0e9a4fcd23c0e489aa3cf3fd304f50b624bb2951da9af0dfe5b3
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 17688 bytes
SHA-256: 8e336d04dfb08f2def5e59c4830092e0913bfc39bb5dd8b1b68e9ad4327ea521
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1