Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dccd36388944b5f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 08:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6afe86f35d6bf77c801dca7315517f87 SHA-1: 4f36a9dce4e3b49c9dcbeeeb7ab884ea7492c439 SHA-256: 1dccd36388944b5f31d3e8fb98d2ebebd7e8b200ab099a0a221d328cd3964615
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to host and distribute a second-stage payload. The primary attack pattern involves luring users to download a PDF from a compromised URL, likely a phishing or social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vanphongphampmc.com/upload/files/xanep.pdf In PDF document text
    • http://haiqi-machine.com/d/files/faduri.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754da15208a---fojufelexapatuberod.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/dvlrht7en1lngv5t1bendh4ce1/kenofug.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072792a97717---jotezax.pdfIn PDF document text
    • http://dhf-china.com/d/files/99381954863.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/59744337991.pdfIn PDF document text
    • https://sambelteri.com/contents//files/sujilekonekutawaf.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/58453064268.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce78612026---6949497982.pdfPDF link annotation
    • http://codefon.hu/js/ckfinder/userfiles/files/dunoxelirafozibasatigi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a7fbedb72---42876101004.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/12483572032.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/gitukananibirumalekovudu.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/84250794133.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/duduzu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7c107d17eaa0717d19dc701dd7c1df1/petifopijojewepiwajem.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/bezufawoxa.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/950464636.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/25215261626.pdfIn PDF document text
    • https://duvanco.be/docs/files/lukotovebumuborovogudir.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/j8r33s5jjcts9b71fniiaid676/tagaluviju.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28347630623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=company+visitor+management+system+project+report+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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 11260 bytes
SHA-256: eb3828a8f2e5ac719ffba0056c9c2f6f108595dea6896174e509784ad1929954
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 16984 bytes
SHA-256: e0cde047430ab003124b3c838e34d7a8e576c7a8e62bf690c48ce7bf23aa4a2c

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