Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47bcfb1dc16abf1…

MALICIOUS

PDF

79.9 KB Created: 2021-06-28 07:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a44d718fbc6bb452346f620769cbbfa SHA-1: 959ef215549bbf414c6a7bfbd098ddeba9122fdb SHA-256: a47bcfb1dc16abf1db0e7f474b40262d04662ddff3d958ffa7c189cc8d882a50
156 Risk Score

Malware Insights

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

The file is a PDF detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, specifically utilizing WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://zap-interactive.com/uploads/files/39998809077.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4d740077---49936807392.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075c13f76a91---guparuvigaxawoleto.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f350b87ee1---dewaka.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29b974cb3---66864390668.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5ba266ed351a018d31b55c504c08ec84/powuza.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847cd5157f2---gopuworuduxos.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607657a1e2048---xuxigosulotazatin.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c745f7b6a6---1433577601.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d9ec002b56bc1a38dac0e216b8950852/87576259536.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3867d17e7fe25cf9dd502ad334b6359c/92106597009.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8e781768---54373164041.pdf
    • http://unseenadventure.com/userfiles/file/tozuk.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094839d24bda---dipasovopebanimipanaji.pdf
    • https://tramhuonghanoi.vn/upload/files/xobazoxiwekinexobififanuv.pdf
    • http://canadanur.com/resimler/files/ruderanafexosafevofawuka.pdf
    • https://aulacvn.com/upload/fck/file/23392952734.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073983b0ed12---99413335854.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb353e859782e441beeb01f953f860f2/biwatuxozu.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cde47603765cf6a61264399dfdd74d28/99371811422.pdf
    • http://recrute.fr/files/files/58267514421.pdf
    • http://bookblog.kr/data/file//files/nuxob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+export+pdf+to+autocad
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d833.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 16792 bytes
font_01_sfnt_off0000f04a.bin
1ab766c3cf9f6c81686c14625fc7c767627ada016d50caf5cd6cbe4c2d408b9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10480 bytes
font_02_sfnt_off00010849.bin
877761d2c094af066c7ec188a67c24a07dc7cb99cb56954ad0f40cc8b5b3740f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 16440 bytes