Malicious PDF — malware analysis report

Static analysis result for SHA-256 0377051454cbcfa5…

MALICIOUS

PDF

116.5 KB Created: 2021-08-09 00:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56847ca9e008d5d86737dfacad58dc92 SHA-1: fc2bc07179f3e6638786a9942012ed15e3c3d569 SHA-256: 0377051454cbcfa59ca9f4c5e047d39eb480807f92279a73a16522eba8321ef9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9159

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/06o2cm7bo2u2lauvc6pnv8lll1/lewupiluzakipilafunos.pdf In PDF document text
    • http://remobudostol.pl/pliki/54834375111.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/84331966920.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6d36107ee90590ec9c82943cbb2c9cba/liwesupukisovo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/misiwurezu.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/11628941014.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/tadizewuwipezusixi.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/linawivinulasaler.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160963058ce3f3---58883877176.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/sixufi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ifp1e6paf8k1d4sv3tevahaqqt/zotenapawoxasetigopik.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/1dc51ed8600f97a75a83d119f3abae30/xularovibezewivanufunano.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/logupu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d827d2219b7---kawikutosidijof.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/998306f76c80464652efab4cf921b098/88954197227.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f5557d79c---7701648033.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7072f24964bd23a662275bc47494a228/femazupudagelafotawubugel.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2112bafad25b27aead08b2d36e6379fe/50291215361.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/60c4a510e8c9ed5c66180f90704d39b9/48489531396.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/h37f898do86e340hmrflvvt8d1/18151477838.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/19/sirej.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/naposonubepu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5fcd46ac---vaxalapimevonabupo.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/nexiginarapoxogimakegil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+3+wii+and+ps2+differencesPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/zexej.pdfIn 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_off00016315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B22 2484 bytes
SHA-256: 114af248d43f733e47ba63c6a4bdc663b073b86dc7dab5a0e24373e54a6cae48
font_02_sfnt_off00018607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18607 11668 bytes
SHA-256: 799136abc7092f3a78f6f7e21dbfa7ea5ef6ab6effeea8f7b813ac3d9c29efca
font_03_sfnt_off0001a17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17F 18056 bytes
SHA-256: 20eef58341d8127600af00174825f128fcc21d496c4e8989208344b6f16c1c52