Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ea6de201a7267c…

MALICIOUS

PDF

75.7 KB Created: 2021-10-01 17:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 579daf0fe8439ca4bce187e643909d6e SHA-1: dda160d858e25ab97937731d64da53ebc5138fc1 SHA-256: a7ea6de201a7267cdc38bd357bcab44ef6c96d602843653913cbcc66fa3e4e05
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c61bef63598edfc3ad5eb7af237fa0a0/sokinigiguxex.pdf In PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/16935531890.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/15530746753.pdfIn PDF document text
    • http://belovosushi.ru/files/3864411673.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210919_04DD5350FC72DF94.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd6d5011---guvadarunaruserafibekagip.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/47284970614.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/746383423.pdfIn PDF document text
    • https://ferropula.hr/files/7783892020.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10a0d7281---jotewetubatuzef.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/ziduzifofizovogafi.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/defozudamojiroxut.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/puvufepininivokumawanafen.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/59910997236.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/9450884139.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6b9b0918---menudilaken.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/26511338051.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7cbc7101b---bagoju.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/8555364732.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/63031978542.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/42869481260.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/98301542912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=alice%27s+adventures+in+wonderland+free+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_off0000be42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE42 10880 bytes
SHA-256: 79a8205b1ab3dbb80a54ec012df521897ec85138983c011007da62413e4e9d8e
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 18672 bytes
SHA-256: d4b4518a8e2219e8547c3b1445b329dcfc1aa82cb7c848f075aacd4bf83f88a7
font_02_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1