Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1dba5e32c0194f…

MALICIOUS

PDF

84.1 KB Created: 2021-08-18 00:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 818df61df27fdd4b4fc77326c53bc62d SHA-1: 8a2d8c44bf3822024aeb9eb81c9214fb22479f94 SHA-256: 8a1dba5e32c0194fd0d40b6baca16b8bb86fce553210bcbbc5968b0315c663c4
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which are WordPress installations using the FormCraft plugin for file uploads. These links likely serve as lures to phishing sites or malware downloaders. The PDF's structure and the nature of the URLs suggest an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/160870c91e3b08---51953916420.pdf In PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/9823842713.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607155abd7e69---25079895144.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba0e64723---90933977514.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/fumidililikesuwutiwinina.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/l97aa40t1orm6okoa00iqc6a9r/rexakijifulodizatin.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/17988911301.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d63ce244---72338955545.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/70835856157.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/40059924749.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/84209324650.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2c149n4kgq63s422cunjamqsr6/93409971955.pdfIn PDF document text
    • https://kede.org/userfiles/file/fupuji.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/kixujuzasiloleliw.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/liwalilavivumedebafigus.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/42973013736.pdfIn PDF document text
    • https://digireg.pl/upload/55122938864.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/2348178711.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e84d15d74b9---31901638804.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608983cd0f100---9745954920.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/kekube.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/08b514d11d0dc16ceafa50b1746d9f83/56547377332.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b433ac8bc39---kiwugunijaxuvaradafitug.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7709946e62bfbb08c8581ff2e82db09c/jisawurudagibaki.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/xasovefogodizobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=does+google+give+out+free+iphonesPDF 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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 16500 bytes
SHA-256: df23a4bd9f4d7a95220a6839724204b425b1f9ae9feed14c67a90d297f0a7bc7
font_01_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 10640 bytes
SHA-256: 22e889268211fbf590d310d6c1c3f735a1bb852ba07360034c7513c42c6cfd34
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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