Malicious PDF — malware analysis report

Static analysis result for SHA-256 830ab778a37bab11…

MALICIOUS

PDF

113.3 KB Created: 2021-07-23 02:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8094e5c63f7a364504fc57ff460b055f SHA-1: 9509c18e52f0cbd8f1668b3e5cda931e6fa4f04e SHA-256: 830ab778a37bab116be1ab2cb861d63fdb5ff58894c6bb6459ee0f1c405bc3fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.companyforte.com/imagenes/editor/file/14712632111.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a4fab122317f790fc870ae8c0b5c1844/129078666.pdfIn PDF document text
    • http://benrassam.com/uploads/files/raguvijorafijenirekos.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae4aa8209---muxoxijego.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c905319c0b---sopitesilatagogumapetam.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caac3123906---dejiluzewug.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160983d38b3cf3---julilopevam.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/26271621916.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbc0cbbbd---luraxurunipagikebakome.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xavinoxotexeb.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f173ac0b5d1---lazatozefezoxoxoguzo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/16566104913.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/fugozizetuxuk.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vidizevafof.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074692d15015---31555702030.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/21095462429.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/5scume49d8kv620vu6ll68hefc/74814082435.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/rimudumezik.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/i6fiiogodi4rejlq0vd88dvipj/bodajubafitez.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e65b409ef---kuzageferepiwisuw.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/68029656112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=td+jakes+david+and+goliathPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16708 10676 bytes
SHA-256: dbe1e960de2bbf1842dd4adfc0a8ea18899a0954e3ec661d364e972497de9402
font_02_sfnt_off00017f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F38 17796 bytes
SHA-256: 8c5412b7ee2bbd9bd1f772a4698c685d65648cecbeae29cd76db797c3095549a
font_03_sfnt_off0001ad92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD92 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

Open this report in the interactive analyzer, or submit your own file for analysis.