Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3b6e49bf2e2c4e…

MALICIOUS

PDF

77.9 KB Created: 2021-07-03 08:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 896eb617b1c928f75e769724478f351c SHA-1: a9d606aaeb19796aa48459e6a5c77e735e2d6824 SHA-256: aa3b6e49bf2e2c4ef6304f87973453a6bff496af85342e5a5378f48c2134a8b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lead users to phishing pages or download further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the ultimate destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773cc04ca79---mipojipi.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd9c355bd---kagexowipafe.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/wisuzulofuji.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/800da8bbf31798b4c90f8e2cb859718d/57078656888.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160727ac76b012---kasixuwakopefadokifa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76abe52a26---sanapegedasawosizafo.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/5190602951.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/jaxemojekam.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/68211840603.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/75096869123.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/91035519102.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/fipexadoxerixuf.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/girusevixelamikifu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/27d674007d986b2aeb0d66106f3c49f0/67660599059.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d09a16547b26d441760346195787b94/wanozonanuwaboweweb.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/fatezava.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/rib05g0dpqirqb4immboubr762/22215427028.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/62d6b038e9914e743ca497ae681142bf/91728467665.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/22298147779.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/gasijalitiwokivobanun.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/22400428657.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1ea78799e737c444ed1d92f35e45702a/95598284418.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5e4b4dea1e131c4e37d8be906a6e1431/60865114277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+solve+compound+inequalities+with+orPDF 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_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 16240 bytes
SHA-256: 7032c4db6971179c3451110aacbb0261f7000169de255f946aaf536f3d915262
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 11168 bytes
SHA-256: c21d55ec14a9d2087e6ea2599f521978fcf9ec449ced11c4e7724c2a08cac234
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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