Malicious PDF — malware analysis report

Static analysis result for SHA-256 157593bf488075c5…

MALICIOUS

PDF

123.6 KB Created: 2021-07-06 22:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b2eee6d0aaa6dbbf7c956ca30f673fa SHA-1: 779af07bde4caeb7d4f7cd11eaa8bdb77794fd75 SHA-256: 157593bf488075c58c8fdab5dff85e6d987335d38b2d8e679cd9cd7890af8755
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking human-readable content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.awakohchang.com/image/upload/File/ogosulow.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/58530514402.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/89742313550.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/33452420391.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b4a5f10c5bf23bc66b5b97856770e844/wuzarusanu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7ff435ae---27917897911.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/84a4fe12a10a4d94c8c45c03ab16565f/72883198392.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2218bf2c1---wopekewedopukak.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o5ie3ia3mb497dkqdme53fogj3/pulitifekewos.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/wolifuforopomiwebawovo.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fevazowopevolomuvatizom.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f617c9bcf0---83827445692.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160786b0ab54af---puwoloxovudukote.pdfIn PDF document text
    • http://qca.ch/userfiles/file/dekojegasexefifuwok.pdfIn PDF document text
    • http://netflor.pl/upload/File/kinupekate.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4ddb117b877f9377e8c760ae88a28e81/86157305628.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/pevabifazonuvuvufaberoxe.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/86590105310.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/70604802608.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/zenorezamuwazuxurer.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/97517076820.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u6fsj1pjeilfmqlinene3qclq5/84957418229.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cbdd7d336---71445421169.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a258092f049---pixokudaburomotakubime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=power+animal+meaningPDF 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_off00017faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FAF 10272 bytes
SHA-256: 70ba11f146a2913acc90a8f192d56f0c8991792a43e13213e584e5646b168b0e
font_01_sfnt_off000196c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C2 20244 bytes
SHA-256: af741e3b57a54902ed8ecc77b5341cb6e656f8a14bcc8bcf3370198cd25a4ff0
font_02_sfnt_off0001c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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