Malicious PDF — malware analysis report

Static analysis result for SHA-256 275590a9b47cd818…

MALICIOUS

PDF

81.6 KB Created: 2021-08-26 02:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64921a477e4dcf7eba65873adefcfd74 SHA-1: fc75d601eee5e6921e1ec0b5625b7ddf405f54b7 SHA-256: 275590a9b47cd818516f9f7bfa59bbf1da52da69ff8286df82c76261369a40b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting domains, likely serving as a lure for users to download malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://industrialdevices.in/uploads/fabewozipaporezezes.pdf In PDF document text
    • http://bigxra.com/uploadfile/file/2021051422381573499.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/fupusazasigofu.pdfIn PDF document text
    • https://digireg.dk/upload/8942368730.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/kozodijakusomowodopi.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/936fb9d48aef202fdcb536dafa170d42/kapekanuvin.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e83d76150---78153864088.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/16138853600.pdfIn PDF document text
    • http://gerocuki.hu/user/file/folirovifavexujajufiwirit.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/3955072267.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/vasozupumaxiguritezogover.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/62766931800.pdfIn PDF document text
    • https://123natura.com/stockages/files/17748180564.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0d90510283cfe8999e082aaef67780f1/boluvawekigodo.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/44389889632.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6e2s19fc06s4ojcmlcv7n45fh2/82158856315.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/puwox.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a98b9d4f0ee4657ac1464c843571bcb0/karibijelakumes.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c932e9d217---71152330327.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/fagolezavimugazimigizejo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a15a1bc7ed8eafe7cf9b1bbc70126954/bekipinugarojud.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100f88736ae3---89311880199.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/22645382929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=obs+studio+download+free+full+version+for+windows+10+64+bitPDF 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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 16484 bytes
SHA-256: 85ca089ac861e1e363e98431898d30514ce42f01ecea3b1bc21a005e3b6190ef
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 11184 bytes
SHA-256: e83dbed94185cfde155d8ca71074fbee54f1eecf950031d54a0ac482b140915f

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