Malicious PDF — malware analysis report

Static analysis result for SHA-256 3015a1f6183ba72f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 01:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5e52487893ee81d1c2d97b5e2db498d SHA-1: 4ba329d0a17516f6e9f908dcd293927455af9804 SHA-256: 3015a1f6183ba72f45a444ff2f2e0f54fef42ff48f62d043c16e9e4a34a87990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's part of a link farm designed to distribute malware or phish for credentials. No scripts were extracted, but the structure and URL patterns indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dfh-consulting.com/userfiles/file/doxedolozoxenekodu.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3074e3cf---74650448713.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/96903327203.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f614c7c1fc8---revaranugogezefo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0m2rvlcm379r4v46n9u4cngq38/59489338633.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/nevig.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44e310dd9---84825868502.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b8d4ec35---pirujazugisujiwunuzoru.pdfIn PDF document text
    • http://huiking.cn/uploads/file/190234002934.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/tibigefamubi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65f8866384---67829008559.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/39108067502.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/mofefag.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6ef9bbe8---8475946349.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/39ca210ad87018d7f7eb96c9f7ae948c/gogawe.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/eeb068700c56894dd64503c5cdc98a59/12348835866.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ftk2avsrsq3qesqnn8ev36n6j4/86261557776.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/95570253095.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/47416493223.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/93586690664.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/durivewufatumelibewogaje.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/20276703251.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2c8483d8447c8b9ce5ba6481af1ebeb9/wifapogod.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ebe393fe9a1c36e4541e93aa536b8728/72350250496.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160921d6ec1111---pafinaworenavagobisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=manualidades+slime+caseroPDF 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10524 bytes
SHA-256: a65d0b12345119e8a7fcb2d640c731acdd87c8225ec1f438b788f4b92fe412a2
font_01_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 20008 bytes
SHA-256: e29205d1e0302374081334d5116e69be92060ded9c63e148f58a0ace7ede33b0
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1