Malicious PDF — malware analysis report

Static analysis result for SHA-256 5960a81a1d0126ab…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 04:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6a7ffe9ce67530516b358f2abfd8e74 SHA-1: c6f0eefc3e04437001ae827a8ea739b60ea286d3 SHA-256: 5960a81a1d0126ab17805e641ba14916f25aaa4397024bc2f64a17c2e6eb3cb0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are hosted on compromised CMS upload storage or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cuanhuadanang.vn/uploads/image/files/50972757152.pdf In PDF document text
    • http://mybyblos.com/userfiles/file/luxafunalos.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/ribisu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h3f07n5ctd2arglhm7ac5bn8u0/22552625573.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b664f345---pikosaziwujupezokosalo.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210911141055.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/ziwikatubixelawoki.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/40872295010.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/sitimowumopufuxizufafofaj.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/mizasami.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/mepawuzukijinerupakabo.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wovoli.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/81686296450.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/tomokafanawofa.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lodikiwurafonapekizuxa.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2b4b615d---51103810997.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613685c405d24---22899607188.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7d20f97f26bbfb6148b23e462095a09f/79420562829.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/54683482532.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zifofapufirobogob.pdfIn PDF document text
    • https://mbbs.hr/files/gataj.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/77487430267.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/wudulim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vido+lyrical+video+status+maker+mod+apk+downloadPDF 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 19620 bytes
SHA-256: 3363bdee41b4329f12194ffeca6225a5a98bda7d59af1917319312b95048f684
font_01_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 11100 bytes
SHA-256: 9ca1cf774eefe0ae8859c80a4073ef3fbf2355442a1982f2968fc65813c0ea5f
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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