Malicious PDF — malware analysis report

Static analysis result for SHA-256 86831d878e93128b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-19 19:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a60cd740205fafad85a39ad18ffb022 SHA-1: a5547838836ad6b7fd5c7a3ed163b1f8423c5442 SHA-256: 86831d878e93128ba4a2af0b2a3ec21de7c790933f65e45766849b261f1bde39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised websites, many of which are hosting further PDF files. This structure suggests a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4a8b3290---55809556701.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5f5cdfca---22927246220.pdfIn PDF document text
    • http://usateatop.com/_upload/files/84852397355.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/28909168789.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85c1bf9f2---96684295559.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/pukaxorisunetinipu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fd9cce59---99222328758.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/soniwinotetobobelo.pdfIn PDF document text
    • https://ovalpolycoats.com/media/16524145694.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/222aca1125cc655315b10266c6d28952/38757179459.pdfIn PDF document text
    • https://airshow-bg.com/file/4380044298.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cn1rp1ag2acufjv76qfd5d16u1/59670105410.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ef06e17d832f8a851a0504c1fb3c1d22/21007119785.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b5c7d90e404c753d3122b015403efbd9/zinikakixo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9d25d01d38de983b2f136134d84ea497/26865863083.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea1c95a4a4---lewedatanofujosominuxor.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/zolanaralaz.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/73847577267.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2693e8d024---40562679989.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/61721910138.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ff306b0f---34748970049.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/parunogujibirubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=windows+recover+files+deletedPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/517ab483f9bfd8f6e3c91b81e600c134/95385437977.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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 10452 bytes
SHA-256: 825eebdb051b4045df7681b0b629d6f3e27daa010c8925538af9dd799c42d266
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 17276 bytes
SHA-256: 72382a098189b77aed9c71c369f5b680e94ae4d5a33602d066c06273b8d78e44

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