Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49fc5ba2844cc80…

MALICIOUS

PDF

194.3 KB Created: 2021-08-19 02:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3699948724dc0410970e41dec5b165a SHA-1: 303a2ce92f9505fb3de07d9c4887f33ead4e2ac7 SHA-256: d49fc5ba2844cc803140d853bb98e0ab6d99e7f81dc42e026f5bcdf360fa7e92
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://chandigarhdatarecovery.com/files/file/visatotumexulowizabixuje.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993a91a2f4c---niremuju.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/94628857715.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc492a221d---vodukarosoroxigupixarud.pdfIn PDF document text
    • https://12waktu.com/contents/files/gotaji.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/noboxikadipuwutarejituzo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edf2c26bf9c---jisesolulegu.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/88026417209.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49873736313.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/3294340226.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/22811130659.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fdac30e8c---90750738032.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084aba36fe31---sameweteserinesufurajaw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/93484358224.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db564a4be---domobokobujuxe.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210715_225440.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/3695737683.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087530bebf18---1172506146.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/minaxexagamimaxamorigev.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16085eaf96340f---zonanirusitibikere.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/gosumegopakizizufojizo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fao75f0rtbtr3pdqd62dkum3j0/bipozisajaturijeriruzusiv.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d55c7aad6fe---77396654370.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/63086900809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=this+is+me+letting+you+go+heidi+priebe+quotesPDF link annotation
    • https://b2cdemo.tickets.com/content/files/soxalasumetafotodutoko.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_off0002987e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2987E 11140 bytes
SHA-256: 085f1b651fdc88e5f5fc4ec47c47e99aba98ce8c8c086484920086ed90e65aa4
font_01_sfnt_off0002b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9A6 18104 bytes
SHA-256: b323582ec180bc452bb60591fe51363ab5ea36fbb97cee42c90310e4d13f9993