Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0222b8faaae592…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 14:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc4be950b0693afdebef8ebc88664911 SHA-1: c09ccdece58c14641bb6940e94cc4b1d118ea31e SHA-256: 4f0222b8faaae592169fad6fab82760cc3f9c1ee6c06db4bb757197f69375711
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains, suggesting it is used for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs indicates a potential tracking mechanism for campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=mixing+alcohol+and+librium PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a082d2e892d---vivugaji.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/396a2a4905c0f8f01a083b247c97d226/nojebotivuf.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946d1c5cd1---sujemorerepu.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/43719847477.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f107303008bab6f23e6305372d1d4575/45169950551.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/bfc604f75edcde04589e3e12e9648cd3/dalevenedafamerutikerol.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706adae55ae---tuwibibazikuno.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/77444753336.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rorijulurexegogeduz.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/82364508463.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/22340328982.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5be0cbca---fafizijajitonuriwese.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ub0g3fd3lqabokus0urbg04sp1/wamawikosezimut.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/93747283449.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b7956298a7b134c773867e08bc61b7a9/robiraga.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/28a423861b3161e150a43ec13a4359c6/55771106187.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92c579f27---23845827584.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/s0ssi8p1ajvo58lpglj55ahpjd/9823036748.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/19438261356.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/76549673404.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc17a141d---81674890870.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5d88e8f08f65531b8e24832d2eaa5f8f/58109861505.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/26376998613.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/16566681753.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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 17148 bytes
SHA-256: 344b65aec0555b12486c322ffe9cac9ffc6e56bec91eb0ac5e1889edf4f1435f
font_01_sfnt_off000115ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 10752 bytes
SHA-256: 8f4fd156404e22b5d863e9e089e9d2042c15d52347fd7bde439b4b5a4e41f1e2