Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c8a14f64a57c97…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 22:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d07194b2fa545a88bc1e9d44b7a9d0c SHA-1: 5d0505ddf5b393b037196321ec4f9150562f2ef1 SHA-256: e1c8a14f64a57c97b79bc998652a9616df4da6360fc3109923b89e3486f039ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are indicative of a spearphishing attachment, likely attempting to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://yljx.cn/images/upload/File/44450044974.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1e49d16cc8d050fc0d4044862f3d1b89/70971882373.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/tetemi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/kofupupigasigenu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc06615a81c---87124195110.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905eebdd615---xebixumapudimego.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f2655ef3aa281ce90eddd7f725e18d8f/97348391665.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/dojujofuwase.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jnnfju5sv2nr0ishta5ahhs5rs/85371823578.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/pokuz.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/siziber.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/67chvo4cbtq98kle887mah6b5h/bularigoguxezavel.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/rikonob.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/34766581338.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/lolafuxefafotipojov.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6f411e40---29403860625.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b597b53f29---kedudorivuture.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/dunufuxowafusovim.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zaxibudawitugas.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/lenogapiguvumazukelemadi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/fogomilideluzu.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/bekosimimixigebimipafi.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/foveto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cfa+standards+of+practice+handbook+2017+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/986eef02f86eb67f5f935758488c5ba7/kuxawolemimabokilamefo.pdfIn PDF document text
    • 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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 11280 bytes
SHA-256: 52a24a176b10bd78062960e4e606ce3283bf148ba5a955234874bbc6a1c1cb57
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 17564 bytes
SHA-256: 6613a8d63f48661f4cfd4f739d755d0b29cbdad87c878fc46c54800388f55a0c
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1