Malicious PDF — malware analysis report

Static analysis result for SHA-256 5318965a4a0ea1e3…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 09:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: eb32d46e675adacc421d539d5bf7b18e SHA-1: 27117ee98ec22451a7ca2b9e56bc194693dc25f1 SHA-256: 5318965a4a0ea1e33dcb165be2d6e2f5c5d8d38a62cd87c69bcd278d94fe61b7
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://farashimirooz.com/files/xonuduz.pdf In PDF document text
    • http://ginzaoakland.com/uploads/files/56080304249.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/puwawotusuwe.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb854627d---magenuwokifepugifezew.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbe079f23f---kositirer.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/poxusenilibiteker.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0iqa7odukj7drhbvdphkho4p5/52079290123.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/jemoze.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/68014321001.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607909f2ee0f6---32578820085.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/48022440985.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/56065083749.pdfIn PDF document text
    • http://strandedtattoo.net/file/wariponojavubor.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vokifituwonaboziwinipewur.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/i2tc0hbo7nn1c5csfsh866etc0/bopawut.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/15650986819.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/pulejogoten.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/52979483392.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70eb1a90f1---26486942013.pdfIn PDF document text
    • http://sowitech.vn/upload/files/teviwowofaxujukezixomuwu.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/16236496783.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b05d8599b6c88e2e4715f65da16a34cc/82356827137.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/6708073825.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/83ea3f12aca1492341c74efa5d4a33e5/62215493150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=does+iphone+have+nfc+readerPDF 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_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 10640 bytes
SHA-256: b2e8273d61af6a119e0a0d03efe52437ffbdb38ecc6acc4a8a8d1b25f35ee86a
font_01_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 17148 bytes
SHA-256: e8f05c0a3417992229d3c65dd76985b391078cf5a4919b95cc738b1f7852fdc3
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1