Malicious PDF — malware analysis report

Static analysis result for SHA-256 f083f38aea99e19e…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 11:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e45d9f9edd26b8adef6ef78a8cc72111 SHA-1: d3fafb43e11d49ec049af220d7cda5cf13b9874c SHA-256: f083f38aea99e19ebb8dbcd755ce0b951e471e5e55e147e299d2dc3b5dc2fbf5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm nature align with techniques used for initial access via spearphishing attachments and directing users to malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://nuovojob.com/userfiles/files/wedaxetuzovofixijina.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dc835151---44777060998.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/pawofurorefavujize.pdfIn PDF document text
    • http://ruihuitax.com/files/file/tedox.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/0e435f2fa79639ae91951165bbd34f07/gevojudegukixirijosunujas.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80611c4f9209bcb2eabd8266da84ea40/41308175884.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f4c4016178754ed3d1a3ffcd74afd1c9/69205044540.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/52003530360.pdfIn PDF document text
    • https://topupdana.com/contents//files/venutifidipuzabudepumok.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab894754cfb---4391620082.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/07827f3abb885a15226d2789f418223a/xotenurupex.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47cee61470---foxodibifu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27dc44e96d---vopivirobirulugoxovofe.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/99754557025.pdfIn PDF document text
    • http://wenxuezj.com/images/File/28284032725.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/13349738349.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e24a6e1913734865ec4195cb408201dd/sewavixiku.pdfIn PDF document text
    • http://aroma--style.net/files/files/68388464297.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/lefusesunoga.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/pejoxofiv.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b334f3bde---rosot.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jizidelekebubetemabezito.pdfIn PDF document text
    • https://stopserv.ru/files/file/72768118912.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9f346202---20197881125.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fd852803fdf63c40ec8673aff77c50d4/72707232684.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f353f0c631ccdf972b051de131bdae86/zukimidobovodopase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=meaning+of+the+word+spasticPDF 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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 16708 bytes
SHA-256: b6031201ebd2efd1e871cd8e368791844a8bcace66c9b83409a5abe9d6732369
font_01_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 10932 bytes
SHA-256: f4393891989783bc526a9b4854f9f1582812c7ef290c59866299804f524a5ffe
font_02_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1