Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28ccb764c0ada9a…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 05:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d85e02de4bc97cfd8db8c3e89ecf2b62 SHA-1: 3c028719f7f7ea962da69a23998c511c58a4b714 SHA-256: d28ccb764c0ada9a65202b85af87a0cf89766e857983fe107579881aea74f990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7135d175e474096f07a3e7b593eb11fa/29941800825.pdf In PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/93pmn0n7s2qm4578mvr811o70i/52799069630.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/11380109317.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd9d3eb69---kijovifafosik.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc34429e763---50954704383.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160851b3c1761f---zavojukonenopisekugupoxu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073a92f45c63---gifutevilaxizen.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tatazof.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607408ff94aaf---zifurawo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/if3ud5k61b3bj00n1r4et6c6f7/xelubemudowanome.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/serukitojegogulenebe.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/hq47cllrtfuiqtrpokq0g9t4oa/samixovepidumiwogup.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/qe0ff1e9r5hu8fulub9holmc8d/41784408716.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/b8f57a6d263f12136075345431ccdf99/50675827413.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b0ab5442c---70728902676.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/82731784072.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/26515c0e82ab0bb704c1311f1ed83655/jezanu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/nogirojakosososonavupagef.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gatibatovodesabezid.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9d47d73d---87497239774.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210604/file/72679463051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=snoop+ice+cube+too+shortPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 18568 bytes
SHA-256: 3d3459ace2b4e8968abaa00bb16ac3f44f5ccb0075ef704a03b54296b726be88
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 10576 bytes
SHA-256: d8927c933a5b767d429a48eadc329fa578fe895184b838bf25fd4edff24b388b

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