Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe0ecd833425149…

MALICIOUS

PDF

93.8 KB Created: 2021-07-16 11:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4c931126f7a484f94d10049fa51aa69 SHA-1: 46c9fca9816ca385aa2e22e80cbaf4fb1938333a SHA-256: 8fe0ecd833425149085182c51b67653dc780e6fc9164a3e3b46104d7b45731b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to facilitate initial access via spearphishing, leading users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7ca29ae3d07f3f1a0c5857687bb9f14c/94398665425.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/suduliginepinusutopazun.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f11415f4d---zifavemulososibufogu.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/54114077006.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7me6gmpa305o9kpqj6avrafv2n/69785332162.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bomijefenajenilazifaj.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c3ade82650c05b66f26c652e3339a447/62973848596.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e341619fe---ditidoner.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/upv4rr3vb78hlvj7en6ub26m38/murufekipigagemi.pdfIn PDF document text
    • https://tckontrola.hr/files/zupodudenawirabokab.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/xolelawiruparakiganipe.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nitid.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ada49d9a0abd752ac38583e3a99ab2e/lexugekelosuxitefifegid.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc2467791---5082466038.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5279fa64dc8749cd25441c48ac2b7f57/fixafaxemajetovo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0644d00f0d6cea3bfda1696ca3bb17e5/wenodobupumepudisit.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/54856303576.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/23113156853.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c285acc0ab---70054943728.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/wanovabekugifixasotupa.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/bufusiwarim.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/14775655706.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f36ojgomf1ntbig0nepf7ub7ac/fomidaxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=joint+pain+without+swellingPDF link annotation
    • https://lapdonline.org/file/47093841594.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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16304 bytes
SHA-256: 0b652a68b48b9ee17479c785bc9d276832628aa18207d80d6dad4eaa8cd609d7
font_01_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 18368 bytes
SHA-256: b3d1b0ad0a247d3b541ce9eb6210ce8ebdad7e6559697f091e69e255cf6fb52e
font_02_sfnt_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 10608 bytes
SHA-256: 3ce35de68b920db0eefd638c3d6dc46a0760ff8a251b3d26fffe593c5e5cd145
font_03_sfnt_off00015189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1