Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f15ae5b162246a…

MALICIOUS

PDF

125.1 KB Created: 2021-07-22 20:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fc2eb4714f7e3e0fc059b8afc68f6ec SHA-1: 7e8963ed8108ea35028ffa570fd9431b33ad4b98 SHA-256: 49f15ae5b162246a95a9fc8a7bd2e2a49b4f4c79c8f1738a96fe83b9ec9b1a36
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting links to further malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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://acmemask.com/upfiles/editor/files/silose.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/2554679254.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59fcdc72f---23703603265.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/60781665792.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/ritixefasozudawawazoji.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/82577499914.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c909bc6e65---koruvunenaru.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdae9c1f742---42589135888.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b8a8c201---8732488190.pdfIn PDF document text
    • http://195exim.com/datas/files/mumununulanivure.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1adb5dba---66388994164.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7084909f9---77696410409.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524e71c92e---54995298111.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/70603131029.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8bcfe0f531b98d80a8ed27a7e17779e5/gewupufapapubonetoxeruda.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/81135123192.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec6552a85---pigub.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/tososogaxilatijodenoritek.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/59527586244.pdfIn PDF document text
    • http://coffee33.ru/archive/file/57537892702.pdfIn PDF document text
    • https://senfina.top/uploads/files/gipadabexerubunegaxip.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3o5rmgruhnap5e4vjqkgop0ft/51729038266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+rose+and+the+dagger+epubPDF 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_off0001817e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1817E 19592 bytes
SHA-256: c7fa73e97e3741442c2bcbf21c92b67b3000797ba2d0cf1012cf667621fedbec
font_01_sfnt_off0001b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDA6 10736 bytes
SHA-256: d5be676db71906405d8961058886788a97762d0b4cd9259c37b9912b2d6821a3

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