Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc76cc50066dae2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67408a8badce9af8531e0ae2c2893483 SHA-1: 053a48c1b28b48c6897d5e3e716a9806cf4a46a6 SHA-256: 7bc76cc50066dae20efe0854ea1a9b76fee7eabd420708225e28f50a6ac453cd
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm attempts to obscure the final destination. The presence of these elements suggests an attempt to lure the user into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6cc450e12---62532908003.pdf In PDF document text
    • https://dycmc.com/DATA/upload/files/202109050119088179.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/xewidetebikabikozasew.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/bunabuwov.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78a6bf2be---41535498616.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d34f1c984---zetagagulafe.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98092677183.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210918/files/20210918075516.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/nubelipedo.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/21961321181.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/34402701721.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vutafurusasiremu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/toveb.pdfIn PDF document text
    • https://ysh.my/userfiles/file/muboxasogumowizesana.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/febapidojesikozatukebi.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/98704668378.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/jawaniduzigubemepufibit.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/84979791515.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/goxuvotevikuviwijuw.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d735d02d---labunarejorowoniwifususif.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/vafonidenubu.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/11003564891.pdfIn PDF document text
    • http://furniture83.com/upload/files/viwufakukodifivofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=positive+adjectives+that+start+with+d+to+describe+a+personPDF 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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 16744 bytes
SHA-256: 998dc31f951bb2fd12edd5126f7512a65b37ea1e27aed728d27022215237dd51
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 10988 bytes
SHA-256: 4a92fac9534e1fa2170a92985eacad8794bfa42fdc359e052f8fe021111cb37a
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.