Malicious PDF — malware analysis report

Static analysis result for SHA-256 663480b92ff05a06…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 21:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41a98305c27f71c36c5676f85202b762 SHA-1: 462e081b776f79252d3e0e7e53c8ccc0b0b784e1 SHA-256: 663480b92ff05a06ccc2d4f1731abee8653933cd437cce5425f00ab0f7c65fad
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://goldcoil.com/uploadfiles/files/23350516498.pdf In PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/71920839891.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/94066888756.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160764031f3602---lagupamutazebowavi.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/85553481952.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/pidubime.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/pewilafotojetuzesesopixi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/j57abv4eje35q5tohgn5rfh9bc/jafefunu.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/5aa8u00l3d8m6roqjepavl9gsp/deninunipuzowakakukogodel.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611f09ac43d49---91356289596.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/24355698746.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99e2cc629b---33802953101.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/c818l8uredp74u1ghphbid5rh4/nerolivagopakagukozebevu.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210802091125.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/62812782895.pdfIn PDF document text
    • https://bataretak.com/img/files/file/22681766195.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/nexajolewajik.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/lixanifezidaraj.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108231633374217.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b363754c96d07902346cd92c151611da/28203148512.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • http://lovesenergy.nl/file/87410629374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=5th+std+maths+solutions+state+boardPDF 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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 17244 bytes
SHA-256: 4d762f166e9ba7615bef5b01d958c517456d5ec335c6231914af533d24864a8b
font_02_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 10788 bytes
SHA-256: 1e09930d6f7b289983e9993d97e355ba54d8eaea4acdf97d5c885209e3b2e95c

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