Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7965f01afee3ae5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 02:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89053aab8f2afca8317685274919ad55 SHA-1: c189458eabb0c746c8a90f7921ccc496c465fce8 SHA-256: a7965f01afee3ae5c398b3e3bb8a984c2afdb93905787a64355814913e717cac
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fashioneducation.ru/userfiles/file/lefalokexobofewesobaja.pdf In PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/12744961.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/58495011804.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/sokaxorovovelubu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4078bcjf3jggtmq97un93on7hr/xetufawuwoxonajudajag.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/29892630539.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nebogebebetumisiw.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/54372325380.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/14365874979.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7c4462c4---sizivulow.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/56351789720.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/guruma.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305dd14eef4---muvemiwora.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/kisuxezugujovokevabime.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/67449854654.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613170001ca09---6457797799.pdfIn PDF document text
    • http://potya.com/97143323431.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109110520235669.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210904054821.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/75455160178.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/6764040451.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/kedaxa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132828a1e613---75643371084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=alexa+show+5+appPDF 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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 18132 bytes
SHA-256: 6c21c9e86b6cc214237eb418083f88c14684ce2ba32d7a1b618e1c4b2d8e563e
font_02_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 10256 bytes
SHA-256: 2729854349de9d3390090257a3b925cf6d760df93c576db219be993d85589615

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