Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfce0c7f04de70e…

MALICIOUS

PDF

91.0 KB Created: 2021-08-11 03:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: be9c1c17fc751c47eef9ab4013d81950 SHA-1: 225b71a032ee4b3b0e9d8872e67f6c2e4aede2a9 SHA-256: 9dfce0c7f04de70ea6a8f941fab19dee03aff3e9a28b4098266bace919dee3e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to external files, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external links suggests an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://emke.hu/uploads/ckfinder/userfiles/files/61211983599.pdf In PDF document text
    • https://giovannicaputoboutique.com/file/98416559437.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed10f1b1a0---kutibosewobitigoxafuwa.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/24705484872.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3c9d56d7bdecff979d914660548adc42/28556154536.pdfIn PDF document text
    • http://poiskvod.ru/images/file/40811655865.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/38822886576.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/tulatopukake.pdfIn PDF document text
    • http://biosite.ru/images/news/file/goderaragubitedutanupi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/18084909541.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f01a701b9---62437367080.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/zogasenesadexes.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160703c85665d9---83852742423.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd76597adb---68472833766.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8e5efbeae8836cedf7b96a1961becd71/sukobexofurijafogokufutup.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a319ce5a43344f7129c211f7f8853eca/lomapijonofogarukudez.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/popoju.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/2019378273.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///niwuz.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d52aebfe---tekozur.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447be54a7c---wizugikivufaxajene.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=catching+killers+dna+profiling+worksheet+answersPDF 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_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 11108 bytes
SHA-256: d51965210606665b81c92abe2e4a0fe81e1a56a01c0c633646a56a361f7c866f
font_01_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 17044 bytes
SHA-256: 14fbc9dbb40dc0549715a71f5c673ae311400947cb14f15ef98c76ef3ac782ec
font_02_sfnt_off0001455e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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