Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acefe8955491c33…

MALICIOUS

PDF

89.2 KB Created: 2021-07-13 17:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f91c0e4c6338d635f80309e154f522c SHA-1: 7a0109a5cf44f53ed09c414e58cabd29caa35050 SHA-256: 7acefe8955491c333cd111441f6b1de2d0e5e98aa63fe074e192d97daac9ad7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

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 https://laborke.ru/uplcv?utm_term=certainly+true+meaning PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/46a1a57fa23cb66223903708f7962c81/tumilajazeniterex.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/kukakaxik.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xefulabetovotamup.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/51948969500.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080487e26b13---mojizerisuw.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/22280194240.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4d250464---73795918283.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bddea2dc4---6613615304.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/20c15evcmtr0c3qs9ljeob7q2d/66906735421.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/luvugitejewozomitekurijo.pdfIn PDF document text
    • http://djapm.com/userfiles/file/73809575831.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb25709a84---34663197749.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/baa7f97dfeb08a7dfe1e542d8a07496f/zirawejutirinojosif.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/giwixozetebiso.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/15cbea03f20b16516830859958762a84/11020255045.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12547699624.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb207d4f557---zojasebiwarofevolepiwid.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607502737c85d---62979178185.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20348d007c---63559989643.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5de9ea9e75cb37e1adc729734b5e54fa/vubufe.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/93936159717.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c8cb180d---98203867678.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_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16660 bytes
SHA-256: 10bb0c1e78cca835f5a6e7f5e81534e35f82c9d2be4f5405948ef0768ce11b95
font_01_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 10408 bytes
SHA-256: 9bdeba853b0163d41178103b5caacea1b718be6fd14c15fcffcfe7b1d15a500e

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