Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfaff38cfc14fd0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 09:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 374bf0f95007ef32b875155745f27e35 SHA-1: 9efdd92b4858632b07fc98c45b11c15e18e910cb SHA-256: 2dfaff38cfc14fd01d69008475e69f613bcbc0d390cfb8041cd9a4684cfe9125
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=algebra+formulas+pdf+for+ssc+cgl PDF link annotation
    • https://clearpatth.com/userfiles/file/korabufagogu.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/c8f1fc35b032c8dfeb125602e1fab182/54626691455.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8dul7gvculqvjr01fduos89lo9/kekovazej.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/92c57286e39bf9498f8cd161dc927e02/71712910199.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/bekudulabekeno.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/51841473981.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fv1dspm6qeulpqn5on23d8g0rk/wavej.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jamirujog.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/zazaxurewokajebelawel.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/buzowuwebagenixijoka.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/40396540161.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092941c0ea3e---87550586720.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f96d196c6---73505828916.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/xilamikewamo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160abb262425ed---59667488704.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdece3458d---35677571878.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210719110131.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de1d6a099---gadobed.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/suvinezetezukel.pdfIn PDF document text
    • https://master-service.ro/images/file/konazuja.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeaf1072d2---35637306140.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611b931f9985f---89086010769.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/56371333385.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160961990233dc---52028688900.pdfIn PDF document text
    • https://avflash.nl/upload/files/61190187354.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/pedulomukolo.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_off0000bc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC71 18388 bytes
SHA-256: d858702438690ec10199409ef4114919c1932122c78cee302487f0b8ea45cc1f
font_01_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 10888 bytes
SHA-256: 75ab69243dea600da7f0cbf2c32b1a781e28743b26556da08a89eb8f2ad073df

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