Malicious PDF — malware analysis report

Static analysis result for SHA-256 f128fc9a5e1ca3b1…

MALICIOUS

PDF

191.3 KB Created: 2021-07-18 15:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c1ab2d4569f4763603e57c2d3d51704 SHA-1: dedcce89e89a4c21f7d37922d9d3bbaccf64c84e SHA-256: f128fc9a5e1ca3b14c63a184d29b9320fefad3b36582944ba0e46c64523232d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phish users. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://yuanjen.com/ckfinder/userfiles/files/bikokujesatix.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c9913d980---zurifafafagekalok.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0f338a178954fa230d8b0bf99e045003/75428591989.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce6e4b298---6396766441.pdfIn PDF document text
    • https://flyags.com/editorResources/file///dujebigorira.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2282f839---josog.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/nikesirigisemufilozugiw.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/38651569769.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0f7d558bb1f34773fd88a105af6d0843/37339242131.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/pogikalagasetigurus.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b849b6b7ab---16982245543.pdfIn PDF document text
    • https://people11people.gr/uploads/File/24175647280.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/60938955464.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/af2319e373ad4b155af8b81ebf1420dc/6415116390.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/87138535550.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/67982125956.pdfIn PDF document text
    • http://jucal.es/images/file/fufebogusazujif.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e98697d3d550cc176f722b1972b2384/25378042234.pdfIn PDF document text
    • https://tangentemag.com/img/file/jajadazokapatawu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d61ca5b3413---51065817019.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/23735b7185fdf0d1c79343d3bc370c89/todurot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=congress+the+legislative+branch+guided+reading+activity+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002a574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A574 17996 bytes
SHA-256: d7b4d2f4c893f2a55157023937d370bcbc753813491f7637348926c9435d6a9c
font_02_sfnt_off0002d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D517 11184 bytes
SHA-256: 4f5b879e8397b8e507e36f576224d94f9ab3c99e57413c3148a20e0309f55fc8

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