Malicious PDF — malware analysis report

Static analysis result for SHA-256 1907a3ebf51a22f0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 00:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1568dfc5b434cf2597b07889007cf6e7 SHA-1: 4fdaad584b130f0b93bae2d7f219b279cbd358c1 SHA-256: 1907a3ebf51a22f06493cb267acaff25582a827ee026e86f088a1fc376f93133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, likely intended to lure users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and numerous external links suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://archism.ru/uplcv?utm_term=android+poster+maker+app PDF link annotation
    • http://ivankotov.ru/img/lib/file/82696484137.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ed30398---64136048855.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/rimalamolox.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f1c57cc19bb26e2df63705e83fb7c107/13804557413.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135daae3c0bf---22868547482.pdfIn PDF document text
    • http://marymo.ru/uploads/files/1821913534.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d18fa03---wozomilifepuvamobelenifug.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/popabawoxusisemofog.pdfIn PDF document text
    • https://novitas.ro/files/19215164074.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/dokojosidomabibujoto.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/73940491911.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/27368075714.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/1002609501.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/53727719069.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210910120430.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/7189873533.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/87780025832.pdfIn PDF document text
    • https://mavibusiness.it/file/9884730096.pdfIn PDF document text
    • https://12tiga.com/contents/files/kinixerunedururelemisusi.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/rebarava.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/niratanememuxamokovomoj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d952ab43---77998726553.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/meputerat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10580 bytes
SHA-256: 656939221376bd12c93e2ff79d14531cc106cfd662498f4e7604de3992d33b93
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 16112 bytes
SHA-256: 73165745a97df03de5ae12ca3728a6915d938347aaccebffedaf7d90ef951a92
font_03_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 17356 bytes
SHA-256: 51e5922f95124a5f48be6f0a68c67d2364b947605744fba0cda14a56174bfc89

Open this report in the interactive analyzer, or submit your own file for analysis.