Malicious PDF — malware analysis report

Static analysis result for SHA-256 111018d74b555e7a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 20:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af11c228146f2b6b3ba119350e6407fe SHA-1: 0630600ed56e55d25e7ab73be8ca79a38576b641 SHA-256: 111018d74b555e7ab0fb279f3f174127bebd1db8328455a594888a924bbd0ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be redirecting users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sinosteelcode.com/filespath/files/20210908214836.pdf In PDF document text
    • https://loyallcanada.net/editor_files/file/nodumolavapag.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/idvfottlgg90vmcj8ce37h1iv1/zemufapasalesufupusogiwo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba8c5b0bc---89062035493.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/26586990116.pdfIn PDF document text
    • https://onecre.com/images/content/files/wonenabozova.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bonixaluwamonudu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906095319370.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/6157008664.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/fopuvorudunux.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/11670958506.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/46063106631.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/viverelujajivejug.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/norirumamiwarotobid.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136202d97560---wisuzerufawanapel.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/97078461246.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/zorenilozepexonutotovulu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ffdf5b3e7f87dfac4f4bc1ff4050902e/sajexutoduxarenurida.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/vumumulefisinan.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///16515569636.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/riwewoxofenejana.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210909010442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=avalon+hill+gettysburg+1977+rules+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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 17520 bytes
SHA-256: 97e7c67e411435de9440f112bb51b5fe39e886c28cc33410c97b51c3496fc24d
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 11448 bytes
SHA-256: 6830f57377dbaad18b0f998bdd3a670d6ff89088a8756426bcd251831fd832bf