Malicious PDF — malware analysis report

Static analysis result for SHA-256 235936062b467291…

MALICIOUS

PDF

68.5 KB Created: 2021-09-20 03:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 454b043463712c20ec1b934afc271c99 SHA-1: 7e08a84e7e0cb3aa5126e4fddccacce2092532cb SHA-256: 235936062b4672916326b73b2ddb69d428a64e328e510d053ec22a46abdc47f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document designed to trick users into clicking external links, with many links pointing to compromised CMS uploads or disposable hosting. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://siriusdynamics.com/assets/uploads/files/18820124351.pdf In PDF document text
    • https://partetesal.ir/data/file/rejijutalowuwaxubilo.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/bibalawuvarepowezowasunum.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/rakozadamivokewu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139e741ecad6---9747748092.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/tijafuretagideze.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/12166199512.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/73311481158.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161443f5a02134---bunogifeti.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/damoxuwurilativemaletus.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/vafixojotalak.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/36137465831.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/20142873102.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/sojaxamomaf.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2a9aecd9---nuvavujudubijalavoto.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/11493892281.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/76467806123.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/76809834048.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/bodapidajowod.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/guzonoxipijo.pdfIn PDF document text
    • http://elitacasa.it/images/file/42145763265.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109090515366775.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/78815559202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=little+big+city+mod+apk+android+1PDF 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_off0000b0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D4 11044 bytes
SHA-256: 02153935f0381c3f1db571725a040e03b0e2728fbb90b66d15c47f2b2cd07060
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 13816 bytes
SHA-256: ea1c6f46954b9c4ef7f2f5bdef9b7bb5cb444bf1d6e3911bf42922d13cb0ddf0
font_02_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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