Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32c4c087ea02b94…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 11:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae211b3d12b393aeedce77e8c2ce464c SHA-1: cea6caa5fcae4bb710fd4469b06b8a7b97d8e178 SHA-256: a32c4c087ea02b942949967aff09caa5640fee28006d44d7b660b873e617c8c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e5765c5c---75251825133.pdf In PDF document text
    • http://olympicburger1988.com/uploads/files/18298433414.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/mobizazaforemekopikene.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/getovudener.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/sifewifovofajexonilovozus.pdfIn PDF document text
    • http://heizler.hu/files/file/76196771825.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/dorapa.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/wuxapepabalekatipozod.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86afe8bd2c---22203576957.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210823233619_13762t.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bigakubozemurusiso.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/nomapivofadata.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/gegafedawe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880046b8aa---tofirukibuwixonujubuz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd47668d96d---85147743616.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da0014823---jiraxu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/84325943283.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/zenivejomoga.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8bbd43c8---fewexokavikomi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3os13jh7ao73r0083mto6hpecq/kaxubi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/84292560936.pdfIn PDF document text
    • https://ijpdua.com/contents//files/wijujepusujuzeduworonuk.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/45974143676.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/54852181224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=project+management+pmbok+5th+edition+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_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 11348 bytes
SHA-256: 668ae28227f4f22c73eddadce4648bc633cfdbf0ec180735f051b1bcd31fdfc5
font_01_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 20860 bytes
SHA-256: 1e79ef9219b5e8eaa374cc4979eed2613db7140d1bd3bc613ce90119ff01e883
font_02_sfnt_off0001571d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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