Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b54332cd69a18…

MALICIOUS

PDF

110.4 KB Created: 2021-09-04 03:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85d523fedae54bbbad5ea2a3bfd1e07f SHA-1: b2f3f182157966c9a21ae2ca8082d14b776c1f12 SHA-256: 308b54332cd69a18640f277d0e8304cde4e66c37508016a643344c1df15c7d5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF itself is generated by wkhtmltopdf, and while no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/656b0630603b47e41cba14eee52f923f/47772596800.pdf In PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/23761882777.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210623234308_stlzhe.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/xusobemojow.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/dugixukawijomilasip.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7cf441e22545f44869e551b5e0d7254c/patuvipitarewewitakisomi.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/buwora.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcf7ba17ba---lugagez.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e392573ca6---wuwagafawimibadi.pdfIn PDF document text
    • http://ned.ru/uploads/files/26452096765.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/88082495709.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/45902445657.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/rewefijoraxitafenaxodow.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/fapedukiwizetijanisipo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/922153f7225add651e0f2ad75aead7d7/4149098625.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/34960036601.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/43092512430.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/12445284311.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/bafuwuk.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8a9d4780---7765769567.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/jejowojumikojife.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/133e5f3085bf21089a3ccdb9246cd60f/15972067959.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd4822003e---zivetipab.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/60941872818.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/1363586800.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4a6da10e18b8c90432c958c69cba9de2/vipemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pyqt5+documentation+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE8 10964 bytes
SHA-256: 9b5107cf7a004ca0211d44570ff057c419b6b4993c0e7eacca0458d0e254272c
font_02_sfnt_off00017929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17929 19068 bytes
SHA-256: 9b0e76f434de7de501a007a67ebda8a04eaf8d9bfae4d101289b5d96000a548d