Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406e941acc1d388…

MALICIOUS

PDF

73.8 KB Created: 2021-08-08 06:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9f679977b3c039a2b4d7e1eeda01548 SHA-1: 4f7a6b2735ad9f13673b2bba6002a2eeb499be02 SHA-256: a406e941acc1d388c2204828faea7ed22f14e4dbe60a922f1286ed49ddbc4b1f
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bmsorganica.com/userfiles/file/79739487993.pdf In PDF document text
    • https://aonetreks.com/uploads/file/folowozusuxinawigu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n7ph74csnclpld3upccko0tki0/59389903943.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908d6817a9---bigebotasenito.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a186822c1b---wudulal.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/fuxapegulirefena.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c1778503---45511622730.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3194b0b50ead6e00433c9bc906190c92/gajiwozet.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f6851b18dc007953a11b7344b17c6060/13765443676.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bf95ac5b8---93205506554.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4f6c6e1c---javoxumomoruvugobubuzofa.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b9ccad07c074ac23ca826c5548c4602/82923523802.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/jilixufegasev.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8dfbb77039337f4a0cd999066c3e56d0/ganifigusoba.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16230233841548012245.pdfIn PDF document text
    • https://master-service.ro/images/file/477158614.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/xemanu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315da27756---50237796210.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/15408274109.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/20e3e135815ca4598e5337418923589f/welisamojemofulibabunexat.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/27657798607.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f2a2ecca---babexemofiz.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/f9vi17jgu0og3uv7ceahqcfuhe/21817891711.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/23136922708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sp+balasubrahmanyam+hanuman+chalisa+downloadPDF 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_off0000bc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2E 11064 bytes
SHA-256: d8efa31b27475e0ab7759dbcf30edd3f68d92e5e87e807bfef884101e52d7aff
font_01_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 17164 bytes
SHA-256: 76928aa3e33f1043069ce655817ee89eb2e4f8f0c9ad0ac39441c72441651ff3
font_02_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1