Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8551431f58240b…

MALICIOUS

PDF

81.8 KB Created: 2021-08-03 10:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e5fd6487062c1efd3371c84896cfaaf SHA-1: 61cd9c44821c5156d6c58688a783225a23053874 SHA-256: 1e8551431f58240b86742a40b998d08faa5ff2e54fe7f8476e80d7cdebdb5820
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by masquerading as search results for desirable content. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59f38f83e---turodu.pdf In PDF document text
    • http://osteriadelcampanile.com/userfiles/files/15954676755.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/wolidodifat.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/98886460129.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/sezudoravovuselugewin.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1abd27183552374a4a2313b9b6f02584/jurefezusonikoregimati.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/rurumubivilijo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/65270454277.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/26805548275.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/20773383456.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2c2f135b---xiremusoku.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2240773b53---kalatozatibigurizod.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/laxerirakedojadodomixo.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fodoxavudiziji.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5968ae2380579c7a3f75fc15fb7f0274/watedazeg.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f0ead313674beaf7b962e0346867e33a/delikivununeruroguz.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430184919826075.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/bonujujujaxiliduzifasura.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/adpi7qhld9f5r2ou8p0mk5opg1/54145242418.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/22820629042.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/8097218907.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/596b734772600c302f966dc0b266b544/9685515671.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ab213d9c686a02855ed63351e52f4bb7/75321768951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+toca+life+freePDF 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_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 18164 bytes
SHA-256: ed359af6a238741fd5f39d21f6a4cba6781e26ed8cfa03f458be64d1b4145e04
font_02_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 10316 bytes
SHA-256: 1e211cd7f9b7faf3cf93a0437132028ebc44312b3996de64f592765eccdf34e8