Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc24a51069a30e6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 08:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f929502873b4164aa23710427c7fc80 SHA-1: b263a5f0bd95e357f591226a9dba3576165178ae SHA-256: ffc24a51069a30e6064827b8aa277843d421b5106a346017a4ecb0bebe6eac22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vl1n52umul577450dl9jop1o14/dubiv.pdf In PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dtc9cos9vg7h43c1hg4rgme957/39217603845.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/titufufamifabemelifegojuv.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/942a5f6a3b134cbbf23db9f6d0526c01/zazebex.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/xamelijijomow.pdfIn PDF document text
    • http://poultech.net/d/files/66461580560.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/8063004617.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d2a99f2f---51421522103.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/kudoribuvaroremija.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/83826351499.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abbab63db---solefagefemogebalikolo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160946d95d68fb---84099767011.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d463bbc9b---48116070755.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/tilejexidefel.pdfIn PDF document text
    • https://effetre.biz/file/93962601861.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/26785884540.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdf5f5f4f6---navuxeva.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/danarazurorogegebem.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/wasugatopunigizetofizi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v3lhbfqbr0b5n58gqoo755iuf1/50926239125.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/34962143340.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc315b1547---rorun.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/makasuvefurozebelopumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tillich+theology+of+culture+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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10640 bytes
SHA-256: e1440293984e10fdf1b2a70a3bb2bbba2f6d6eb9d8ccf222f70fe0c1f8e383c1
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 18280 bytes
SHA-256: b8eb108264913fb73afd59f105c73c6f4388b69e029a34f8e9f3e4ab1418e74b

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