Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9a486506dad226…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 16:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ca640494179495219e5f3918c9da926 SHA-1: 08330c748e6a40cd6295716630374d656875efca SHA-256: 2d9a486506dad22650ab94d00be3769be71c6076ae98b77bf3b3e08f7caa8ccc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to exploitation.

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 http://appartenvue.net/appart/upload/images/gopum.pdf In PDF document text
    • https://la-klamm.org/userfiles/file/metibevikanudoladufakoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d87348ed---kobupajufelofi.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/xebavisabegimeritix.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nhnbrpohse7qs02ntg7tr64j45/zoborunuvusebovugasunuke.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/74257122622.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/70579893624.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/wuxobugozamavekiwaxon.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf77cc308---devunobezivejabuxun.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/xurewimixo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ff5e9908d75a75c849ce97673f135d57/87421920286.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/51284317499.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa00cea64---16228340410.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/japevarabes.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sekakukipun.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/wusolekiwel.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7d46e41d---34147963458.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/20254139976.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d153432cd73d0337fa53b33e303f4e5/risogexev.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bokakomememelelobiluwik.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/rq24fi4u3oe5m9spj0lb6o898j/popukupewawosaxutuzukeme.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gsihbr18lp9jkbdk0trnkjltm5/69420748330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cypecad+mep+2018+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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 19244 bytes
SHA-256: 9434ad9ee9e289ae472b9520a4f094aa547723860a3c188516c7e200b3fe3336
font_01_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 10700 bytes
SHA-256: 4cf572e90ad56c79096f6124554a3a364484cf6d4b5d44c3ef246da2622090bb

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