Malicious PDF — malware analysis report

Static analysis result for SHA-256 370604b6e5477e5c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 01:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a431cfb8532b819459197eceb3efc2f SHA-1: 358d7104691784b3c6745e3a4665c2512fd4c942 SHA-256: 370604b6e5477e5c805b4afba41bb7bbaceb51bb09ef3d890873a975ce61b264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://onsijsselstein.nl/userfiles/files/7951252425.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/silitilosozirizegisepo.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/vonunup.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/94838741337.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210913075238.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/ruvenedekikodedez.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/96723847096.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/79233286725.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905044939615542.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/firepowuviloraseviloxuse.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161420b3f857ed---zizutizajivatajukabos.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a308ee62---wajuwubexijajetigep.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/8957247229.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/8057878485.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/10792113359.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/p83jotndgv559ss11vr9267aga/folozivojegedaridakoxozog.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/zoxubajojepuminudim.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/4510317203.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/61747215412.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210914file///31858264292.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/85550287554.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/rumavakemumidepadomiremo.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/26190791377.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/90388944870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=insta+profile+private+viewerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e7c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7C8 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000b7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 10456 bytes
SHA-256: a6dd597c9908aa758942426f4e73255bb0fd4c684a5c4a7aa7e79a880f9cc5ce
font_03_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 20804 bytes
SHA-256: 0ea5933699df12142764aa590534c2814daee00524b09cd39b155c23dd7fbdf5

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