Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a58090a6804675…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 19:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20bc47f9001c472476ac7f3ffd5f62af SHA-1: 87a57b99fa74954f2afb30c0fa8877bf1eb20b78 SHA-256: 13a58090a6804675334777e76a76ae24af540c4d8cfca4027a9568036ad4e2b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=fzmovies+bollywood+movies+download PDF link annotation
    • http://cokhitienvuong.com/uploads/files/sekivobowanef.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/toxikijosovusodutubabe.pdfIn PDF document text
    • http://lachina.cn/upload/file/93391847854.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/38014476578.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091519174173499.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/busitefarewojezi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/pufimegamerapomelebe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614572d43f5af---jubiru.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/fasofe.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/bejul.pdfIn PDF document text
    • http://citty.org/images/uploads/file/gitimebejoxixowokerif.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/61817502294.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/81963253731.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/84332680086.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210903100555_1816529891.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffd167dc1---tixun.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dojigirinaf.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/87220988968.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/97425306190.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4d6f83377---kimotuwadosuturaxigitaveb.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/44553756035.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/92417442626.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/jedaxukesevuvegoparefir.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_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 17944 bytes
SHA-256: dc151fa251e3df26121584b1e44fe3f6da4af2ca9620c90607c6cb911ff7763c
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 10652 bytes
SHA-256: 284c29f858564938df266810ac6cf24e2a4e75a2d3b38618964554a41ae6545b