Malicious PDF — malware analysis report

Static analysis result for SHA-256 3622505e4ddbadbe…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 20:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69b2951061a36e83a107ad4cfb0eb419 SHA-1: 9bf86a06ea06e7deba6ecd9a88c658f3063d7c8a SHA-256: 3622505e4ddbadbef45c2be9cc8ac3ab49f9cbbce599e2465ffd2c9f0c08009d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6822da7c2---10086870425.pdf In PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210604235304.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/jugefe.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/385a80bb392492948351297f6d3a1a67/rokixatevulilidalapopog.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2b375527---tepabogoletizozirolobum.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e5779b429b5b522103b817179587d296/37583932997.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e04a55de0---mopajokopobodibulagu.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/72080002976.pdfIn PDF document text
    • https://t2sc.me/userfiles/12005177139.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/63894304788.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/43192234754.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/164qf2t2e9bh7slcjhd4fon6p1/9206896680.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/najowigapelenejo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/97700343475.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/daxorelebanu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/bc293f134b63dfcf6a030e0c627d1ad2/tagotatotudikab.pdfIn PDF document text
    • http://jonme.net/ckupload/files/65255692080.pdfIn PDF document text
    • http://industrialdevices.in/uploads/61594772393.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/24longpcr07geeo5bacbbju7e6/garajonanewefa.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/63709513763.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/83985354077.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dc21996c---80399328199.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/31677610403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=goldilocks+three+bears+story+pdfPDF 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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 10996 bytes
SHA-256: d82680520d080af0de6f8715863972591d1798afac77ad09378fadf343ad84aa
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 18296 bytes
SHA-256: a078c6075773ea99673a4b38247539d1213122d9768b3b54189c596a2045ab0e
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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