Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0253fda4dd7b0cf…

MALICIOUS

PDF

106.3 KB Created: 2021-07-19 09:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70aaae18fe4080a1c3b3c22783c62cc5 SHA-1: e1e7ba1bc2561477f4bf9d5d89ebf251094b1f13 SHA-256: f0253fda4dd7b0cfd803726af752e9ed8fdf513b0a7888508e15a8120c649fad
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The file's structure and embedded links suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/uamcoickeufp2ukpde8hg2lrgj/62739033922.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa33a06d982---90410434673.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/adb0ec6bb3e4ff0943e3656dac5b74cd/26695767807.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pirereresu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/40903457209.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210706_27FBBB9884C7DD8A.pdfIn PDF document text
    • http://ibb-online.ru/f/file/fugewejezamidofogezux.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pininikivepifasikubezi.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/31108378939.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/vtggo5d0fit0pah7aqsdalo0v0/68825329180.pdfIn PDF document text
    • http://lagrupacio.cat/file/bajozovuborivizoli.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/7918123478.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ecc271e510d1014ffc972b5f557dd2b6/karemume.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822a62b35e9---kazomanizu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/77245109365.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/75763204585.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/05d5fd7c4b674f7ec1e43d549e2bc9f8/tibefobatibemij.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vqg4sp996lpokn2ahcjtb9mqfp/jizomowutanudu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93da97a5af---lolinepubag.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38b96e6a6---jikewodorasijako.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/k7phs1cg6501cfgcemfbn3mr5g/ximewabu.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/89407566295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+workout+for+bigger+tricepsPDF 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_off00013e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15667 17072 bytes
SHA-256: 8056b97c2c322df342a86b05abc1f9c2758fe4f3c7beac926aa6e597114fed3f
font_02_sfnt_off000182f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F3 10812 bytes
SHA-256: ba33c199f398ec28c346ca1e99ca7af286d3e563eb52dd842836cde3ea033597

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