Malicious PDF — malware analysis report

Static analysis result for SHA-256 819d357028bd8904…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 06:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cca40217d3c37a49b3c1b4a941fb9833 SHA-1: d8b9cd8c330c0d01ea81a08f6ef17481d105b980 SHA-256: 819d357028bd89044b996ddf59e17d96bea4714bc8f5d9dab7fbbe7d4aa8db26
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=world+map+outline+hd+pdf PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a0ffe7060---kofixareluzibugo.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/fosiwanirulabuxotanawod.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/mupedesi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/du0o7fqvqgufsgno2h46lk1i4b/susubolumariju.pdfIn PDF document text
    • https://beaszemin.com/files/bakazisinipijimipurox.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a71dde4b4579ba01d32e09c97f944957/6969006680.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e735ec06839---86240763024.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c4cc8a4c05cc7d13fc2cddc9adae57e6/nuxekugom.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/relegeromara.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/46167523700.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071735378a82---gevoroji.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/42363982987.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/49220832d0f602fb8638ad66f2115c87/65746171898.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45ca3fcb2---rawabanifedudomitaxugozat.pdfIn PDF document text
    • http://synergyproperty.com/images/files/dosovagidedutadi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ce47da5f7a28e723ddff091661022cca/62403913995.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/kegerupur.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/ditabogofivalavazo.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/66535731627.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/967940302.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/fupogavawoduvawiguserev.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/31184691468.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/fazaz.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1213f9364a62b06a3ab0752b33b0e87f/32935109700.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 17176 bytes
SHA-256: 8f805736aaf42634b093e5d3dae95c97b450e11874df2cf984ae23e5d7a11202
font_01_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 10688 bytes
SHA-256: 3fd66010437e891f68f133ca98edf59bceca56c08e22d03990344c31e0ec8cfb
font_02_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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