Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb12b4b8f26252d9…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 23:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd6d0f4948358ea098a8b27cbde8d086 SHA-1: c16286cfd3c90f4f553ded6d259d799f31d68a19 SHA-256: fb12b4b8f26252d99bfa8a31dcc78087aaac7179158faf6353c5c6930ef7b52f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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://gift-founder.com/archive/upload/files/pezazidezorobupafumiziv.pdf In PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/wemevikinisiw.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/riditosadomubazamemeziki.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/bejiperogova.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zixogabukinuvadewiju.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/56143834036.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/68585613360.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/garapajilefuvopusajo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d8e892cc696c794ca7ad720718c05f1/87692869860.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/guleruvemux.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e19606d55c7b81d099f1cb2841b5e1d5/farakaxepa.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nasunamasamimuxezakepavu.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/79497229605.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/35073816024.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/87059435831.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab48b6b809---mofafabopetefareve.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/91310177424.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/38754671855.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210913235243774968lf3tge.pdfIn PDF document text
    • http://synowka.pl/galeria/file/didoriguzopesoluw.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/60420705776.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/59346317102.pdfIn PDF document text
    • https://citytrafik.nu/images/file/dikalunijuxusabebuna.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/sewijajemazapabapo.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/noferoviligawajadufiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+meilleur+application+smsPDF 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_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 17052 bytes
SHA-256: f04ad7e5a49b11c8e476a3da5608b07cdcb3e0366bd668d8d4d39d56ec45c05c
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 10756 bytes
SHA-256: 16ae08ab7fb31083466ca31dec69dcfed14899217bef47a72a099fc48239b4eb
font_02_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1