Malicious PDF — malware analysis report

Static analysis result for SHA-256 a009eece1e773187…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 21:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8bd5c560078363837fb43f0aaeb35b6 SHA-1: 824dac87300396742662fe3c2c7befcf6d9cc1a4 SHA-256: a009eece1e7731873d101661375fcc0ea6d1d47b308c8120b1a0760c215737d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple link farms pointing to compromised websites and disposable hosting suggests an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://progfin.pl/userfiles/file/buvejupuzoxeduf.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4f7266ee6ae2cbd34f68a74ec4b36fde/81523444355.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57265428689.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/35108041489.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a407c4a41ed4b455b8ee0a29a6b0eabb/2543851405.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/97771498685.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/poweviwo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609849a6255db---22460586911.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/32459818432.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f91511845---43341734624.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098365766482---4251044585.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe0264e73b---59915815477.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/losozolami.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210701054526.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hufehbt4snsl57tnb6361lu3tn/47605225036.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/71522518596.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/22591518089.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/14359999401.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210808235726.pdfIn PDF document text
    • http://texmet.pl/userimages/file/bewuwiwejan.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/jezuwebufupisis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+read+the+bible+as+literature+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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 17016 bytes
SHA-256: 2c5e1c7ff32b94c1f866b0b35d77f89ec9f50d66b92bbe1fa7815c34c2f82a0b
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 10808 bytes
SHA-256: db3c4ebeabbe74436efe44c83b7a74b779c60c5f31e10860b356d9ef53771406

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