Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6514efb687dea3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 09:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c3e680f8d52bfe98a7f1bc34d11d5cb SHA-1: f91c1194407528679cde00d337dd8605380d68cb SHA-256: 1c6514efb687dea3231a1eb1959ac2d0659eea2e5375d7cfa9c0d87e9352edb8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://shannonlakeestates.org/fck_images/file/74598120816.pdf In PDF document text
    • http://allg-gyn.ch/userfiles/file/13195207230.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/1e9b88d77b5cbaa02f49e26c5db01146/melukegopibar.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/4294693894.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c93253d99---pipubarazifakub.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/gekisubiz.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/1361108031.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/nojiwazo.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zokojubosutel.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/231565484.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/dutosopibu.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/46530466212.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/simimununosajan.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/28437628894.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bunuzonixupawalatawesuv.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/av4hlmnigdkah9iohlji91dair/fuxajag.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/fajajafarebabewinumosab.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde8ac1e1d---26233709906.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b923d88e---93133536374.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/srib0gamvf7hs7n4875506k0d0/31900644031.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/85536641898.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fokaseruwewoj.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/npco79khcjgaq65jpl5us11u34/45263825251.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/wogid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=facts+and+opinions+worksheets+grade+5PDF 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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 16768 bytes
SHA-256: 09aaba1d70f522fab87d477b06729b2297a2ce6130ee106b3cdc8b74f1e2865e
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 11036 bytes
SHA-256: a9d450c3b8718560984d2c3855855a935bd47159c12c95749d14ba9d72a5a905

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