Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1985a5f7595bfb…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 10:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 302f0767bc340e898c3bb678fd41c375 SHA-1: 342817eccb40db5ba5e1f43186fd3f38603f409f SHA-256: cf1985a5f7595bfbefc3b2aef7dac662baf28096332056697bc66b56e6f656c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fioredda.com/userfiles/files/16844306372.pdf In PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/pogovova.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb28c213dc---38729226606.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/tegidubutifibasowasoj.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/jedagubuwebilis.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df0920cbc---99721223231.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/likeroboponifovefod.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/dajuvitaxazalugajetoduve.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a0v0ghp907b19icapglkha5lra/10515762164.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/jimaxenuberebixabunoxu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094342bd9cb6---galuxeponaxo.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tifubowurilu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/xerujewajefes.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/43465598512.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/91377539123.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a1d57e63---fofuzire.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jepiwiri.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160775e3708a2d---pojozoveso.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/81633558110.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff160f1025---zepakiwavuvafomewalig.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/jorepodozenudew.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5a7c4783---xulebat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=l%27enseignement+du+fle+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_off0000bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4B 17544 bytes
SHA-256: 99a420aac3f95c5de60172a81b421d3648c789b6929c91096bbc8dd80ffafe9d
font_01_sfnt_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 10552 bytes
SHA-256: 13a91c4a7dc22040a09f36ca37e194c0cd506dd617798e72309605826ae2f6d5

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