Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f2f8b9cbe5367d…

MALICIOUS

PDF

119.1 KB Created: 2021-09-06 09:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4c3f143ac8aa35652c2369210620051 SHA-1: 33a445e656d82377e0f826d2be321c091a23ed41 SHA-256: 04f2f8b9cbe5367dac7fe1464e18f59692611bdc409386d462d7ba2045480b75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, specifically pointing to WordPress sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection, likely to deliver a secondary payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dvkrin3vm98v4cv0ae8317hlmt/96991694856.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/kn92r7ebvd4optgvlp50m1lgsq/posukuzofagukoze.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/70188624690.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/fumixifoxofuvomujo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ec7ede67---kovajerajodobivikudika.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fe0b9288fafbe14017ddd9b00f1cd3ec/kudup.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/15012757952.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/25647048453.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sanakebebaxolezifona.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/36250511641.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tonilasiwab.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1018d5d2---rikimeruxazamegozuloz.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/13a22668c201b2dfd4ce796be5e34468/73417201001.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/80206695903.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/31254647541.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/gipivakikepiberikot.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/lewojewosomexanajop.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/rivakurofaduwulapibuxireg.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210816193615_gm9sdc.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/zipitusisip.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/53910894639.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/2510491364.pdfIn PDF document text
    • http://travellerisland.com/files/88276989041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=software+reverse+engineering+tutorial+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_off00016cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF5 18208 bytes
SHA-256: 90e1ee9150347af11807e0381909ed405b336bb8ab1dca9e728aa9fbc805af3b
font_01_sfnt_off00019cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CF7 11000 bytes
SHA-256: be522ae844698a1227079cf8d7e780687ab6b070a19304b1d30985424de0a6d2
font_02_sfnt_off0001b682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1